Trigonometry Examples

$\cos (\arcsin (\frac{5}{x}))$

Step 1

Interchange the variables.

$x = \cos (\arcsin (\frac{5}{y}))$

Step 2

Solve for $y$ .

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Step 2.1

Rewrite the equation as $\cos (\arcsin (\frac{5}{y})) = x$ .

$\cos (\arcsin (\frac{5}{y})) = x$

Step 2.2

Take the inverse cosine of both sides of the equation to extract $\arcsin (\frac{5}{y})$ from inside the cosine.

$\arcsin (\frac{5}{y}) = \arccos (x)$

Step 2.3

Take the inverse arcsine of both sides of the equation to extract $y$ from inside the arcsine.

$\frac{5}{y} = \sin (\arccos (x))$

Step 2.4

Simplify the right side.

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Step 2.4.1

Simplify $\sin (\arccos (x))$ .

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Step 2.4.1.1

Write the expression using exponents.

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Step 2.4.1.1.1

Draw a triangle in the plane with vertices $(x, \sqrt{1^{2} - x^{2}})$ , $(x, 0)$ , and the origin. Then $\arccos (x)$ is the angle between the positive x-axis and the ray beginning at the origin and passing through $(x, \sqrt{1^{2} - x^{2}})$ . Therefore, $\sin (\arccos (x))$ is $\sqrt{1 - x^{2}}$ .

$\frac{5}{y} = \sqrt{1 - x^{2}}$

Step 2.4.1.1.2

Rewrite $1$ as $1^{2}$ .

$\frac{5}{y} = \sqrt{1^{2} - x^{2}}$

Step 2.4.1.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = x$ .

$\frac{5}{y} = \sqrt{(1 + x) (1 - x)}$

Step 2.5

Find the LCD of the terms in the equation.

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Step 2.5.1

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$y, 1$

Step 2.5.2

The LCM of one and any expression is the expression.

$y$

Step 2.6

Multiply each term in $\frac{5}{y} = \sqrt{(1 + x) (1 - x)}$ by $y$ to eliminate the fractions.

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Step 2.6.1

Multiply each term in $\frac{5}{y} = \sqrt{(1 + x) (1 - x)}$ by $y$ .

$\frac{5}{y} y = \sqrt{(1 + x) (1 - x)} y$

Step 2.6.2

Simplify the left side.

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Step 2.6.2.1

Cancel the common factor of $y$ .

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Step 2.6.2.1.1

Cancel the common factor.

$\frac{5}{y} y = \sqrt{(1 + x) (1 - x)} y$

Step 2.6.2.1.2

Rewrite the expression.

$5 = \sqrt{(1 + x) (1 - x)} y$

Step 2.7

Solve the equation.

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Step 2.7.1

Rewrite the equation as $\sqrt{(1 + x) (1 - x)} y = 5$ .

$\sqrt{(1 + x) (1 - x)} y = 5$

Step 2.7.2

Divide each term in $\sqrt{(1 + x) (1 - x)} y = 5$ by $\sqrt{(1 + x) (1 - x)}$ and simplify.

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Step 2.7.2.1

Divide each term in $\sqrt{(1 + x) (1 - x)} y = 5$ by $\sqrt{(1 + x) (1 - x)}$ .

$\frac{\sqrt{(1 + x) (1 - x)} y}{\sqrt{(1 + x) (1 - x)}} = \frac{5}{\sqrt{(1 + x) (1 - x)}}$

Step 2.7.2.2

Simplify the left side.

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Step 2.7.2.2.1

Cancel the common factor of $\sqrt{(1 + x) (1 - x)}$ .

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Step 2.7.2.2.1.1

Cancel the common factor.

$\frac{\sqrt{(1 + x) (1 - x)} y}{\sqrt{(1 + x) (1 - x)}} = \frac{5}{\sqrt{(1 + x) (1 - x)}}$

Step 2.7.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{5}{\sqrt{(1 + x) (1 - x)}}$

Step 2.7.2.3

Simplify the right side.

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Step 2.7.2.3.1

Multiply $\frac{5}{\sqrt{(1 + x) (1 - x)}}$ by $\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$ .

$y = \frac{5}{\sqrt{(1 + x) (1 - x)}} \cdot \frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$

Step 2.7.2.3.2

Combine and simplify the denominator.

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Step 2.7.2.3.2.1

Multiply $\frac{5}{\sqrt{(1 + x) (1 - x)}}$ by $\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}$

Step 2.7.2.3.2.2

Raise $\sqrt{(1 + x) (1 - x)}$ to the power of $1$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1} \sqrt{(1 + x) (1 - x)}}$

Step 2.7.2.3.2.3

Raise $\sqrt{(1 + x) (1 - x)}$ to the power of $1$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1} {\sqrt{(1 + x) (1 - x)}}^{1}}$

Step 2.7.2.3.2.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1 + 1}}$

Step 2.7.2.3.2.5

Add $1$ and $1$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{2}}$

Step 2.7.2.3.2.6

Rewrite ${\sqrt{(1 + x) (1 - x)}}^{2}$ as $(1 + x) (1 - x)$ .

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Step 2.7.2.3.2.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(1 + x) (1 - x)}$ as ${((1 + x) (1 - x))}^{\frac{1}{2}}$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{({((1 + x) (1 - x))}^{\frac{1}{2}})}^{2}}$

Step 2.7.2.3.2.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{1}{2} \cdot 2}}$

Step 2.7.2.3.2.6.3

Combine $\frac{1}{2}$ and $2$ .

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}}$

Step 2.7.2.3.2.6.4

Cancel the common factor of $2$ .

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Step 2.7.2.3.2.6.4.1

Cancel the common factor.

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}}$

Step 2.7.2.3.2.6.4.2

Rewrite the expression.

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{1}}$

Step 2.7.2.3.2.6.5

Simplify.

$y = \frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}$

Step 3

Replace $y$ with $f^{- 1} (x)$ to show the final answer.

$f^{- 1} (x) = \frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}$

Step 4

Verify if $f^{- 1} (x) = \frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}$ is the inverse of $f (x) = \cos (\arcsin (\frac{5}{x}))$ .

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Step 4.1

To verify the inverse, check if $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ .

Step 4.2

Evaluate $f^{- 1} (f (x))$ .

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Step 4.2.1

Set up the composite result function.

$f^{- 1} (f (x))$

Step 4.2.2

Evaluate $f^{- 1} (\cos (\arcsin (\frac{5}{x})))$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - (\cos (\arcsin (\frac{5}{x}))))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - (\cos (\arcsin (\frac{5}{x}))))}$

Step 4.2.3

Remove parentheses.

Step 4.2.4

Simplify the numerator.

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Step 4.2.4.1

Draw a triangle in the plane with vertices $(\sqrt{1^{2} - {(\frac{5}{x})}^{2}}, \frac{5}{x})$ , $(\sqrt{1^{2} - {(\frac{5}{x})}^{2}}, 0)$ , and the origin. Then $\arcsin (\frac{5}{x})$ is the angle between the positive x-axis and the ray beginning at the origin and passing through $(\sqrt{1^{2} - {(\frac{5}{x})}^{2}}, \frac{5}{x})$ . Therefore, $\cos (\arcsin (\frac{5}{x}))$ is $\sqrt{1 - {(\frac{5}{x})}^{2}}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{1 - {(\frac{5}{x})}^{2}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.2

Rewrite $1$ as $1^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{1^{2} - {(\frac{5}{x})}^{2}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.3

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = \frac{5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{(1 + \frac{5}{x}) (1 - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.4

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{(\frac{x}{x} + \frac{5}{x}) (1 - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.5

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{x + 5}{x} \cdot (1 - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.6

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{x + 5}{x} \cdot (\frac{x}{x} - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.7

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{x + 5}{x} \cdot \frac{x - 5}{x}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.8

Multiply $\frac{x + 5}{x}$ by $\frac{x - 5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{(x + 5) (x - 5)}{x \cdot x}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.9

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{(x + 5) (x - 5)}{x^{2}}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.10

Rewrite $\frac{(x + 5) (x - 5)}{x^{2}}$ as ${(\frac{1}{x})}^{2} ((x + 5) (x - 5))$ .

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Step 4.2.4.10.1

Factor the perfect power $1^{2}$ out of $(x + 5) (x - 5)$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2}}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.10.2

Factor the perfect power $x^{2}$ out of $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.10.3

Rearrange the fraction $\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \sqrt{{(\frac{1}{x})}^{2} ((x + 5) (x - 5))}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.11

Pull terms out from under the radical.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \frac{1}{x} \cdot \sqrt{(x + 5) (x - 5)}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.12

Combine $\frac{1}{x}$ and $\sqrt{(x + 5) (x - 5)}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(1 + \frac{\sqrt{(x + 5) (x - 5)}}{x}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.13

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{(\frac{x}{x} + \frac{\sqrt{(x + 5) (x - 5)}}{x}) (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.14

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \cos (\arcsin (\frac{5}{x})))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.15

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{1 - {(\frac{5}{x})}^{2}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.16

Rewrite $1$ as $1^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{1^{2} - {(\frac{5}{x})}^{2}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.17

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = \frac{5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{(1 + \frac{5}{x}) (1 - \frac{5}{x})})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.18

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{(\frac{x}{x} + \frac{5}{x}) (1 - \frac{5}{x})})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.19

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{x + 5}{x} \cdot (1 - \frac{5}{x})})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.20

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{x + 5}{x} \cdot (\frac{x}{x} - \frac{5}{x})})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.21

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{x + 5}{x} \cdot \frac{x - 5}{x}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.22

Multiply $\frac{x + 5}{x}$ by $\frac{x - 5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{(x + 5) (x - 5)}{x \cdot x}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.23

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{(x + 5) (x - 5)}{x^{2}}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.24

Rewrite $\frac{(x + 5) (x - 5)}{x^{2}}$ as ${(\frac{1}{x})}^{2} ((x + 5) (x - 5))$ .

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Step 4.2.4.24.1

Factor the perfect power $1^{2}$ out of $(x + 5) (x - 5)$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2}}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.24.2

Factor the perfect power $x^{2}$ out of $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.24.3

Rearrange the fraction $\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{{(\frac{1}{x})}^{2} ((x + 5) (x - 5))})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.25

Pull terms out from under the radical.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - (\frac{1}{x} \cdot \sqrt{(x + 5) (x - 5)}))}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.26

Combine $\frac{1}{x}$ and $\sqrt{(x + 5) (x - 5)}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \frac{\sqrt{(x + 5) (x - 5)}}{x})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.27

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (\frac{x}{x} - \frac{\sqrt{(x + 5) (x - 5)}}{x})}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.28

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot \frac{x - \sqrt{(x + 5) (x - 5)}}{x}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.29

Multiply $\frac{x + \sqrt{(x + 5) (x - 5)}}{x}$ by $\frac{x - \sqrt{(x + 5) (x - 5)}}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})}{x \cdot x}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.30

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.31

Expand $(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})$ using the FOIL Method.

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Step 4.2.4.31.1

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x (x - \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} (x - \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.31.2

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x \cdot x + x (- \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} (x - \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.31.3

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x \cdot x + x (- \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} x + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.32

Combine the opposite terms in $x \cdot x + x (- \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} x + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})$ .

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Step 4.2.4.32.1

Reorder the factors in the terms $x (- \sqrt{(x + 5) (x - 5)})$ and $\sqrt{(x + 5) (x - 5)} x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x \cdot x - x \sqrt{(x + 5) (x - 5)} + x \sqrt{(x + 5) (x - 5)} + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.32.2

Add $- x \sqrt{(x + 5) (x - 5)}$ and $x \sqrt{(x + 5) (x - 5)}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x \cdot x + 0 + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.32.3

Add $x \cdot x$ and $0$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x \cdot x + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33

Simplify each term.

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Step 4.2.4.33.1

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.2

Rewrite using the commutative property of multiplication.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - \sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.3

Multiply $- \sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)}$ .

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Step 4.2.4.33.3.1

Raise $\sqrt{(x + 5) (x - 5)}$ to the power of $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (\sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.3.2

Raise $\sqrt{(x + 5) (x - 5)}$ to the power of $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (\sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)})}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.3.3

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - {\sqrt{(x + 5) (x - 5)}}^{1 + 1}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.3.4

Add $1$ and $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - {\sqrt{(x + 5) (x - 5)}}^{2}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.4

Rewrite ${\sqrt{(x + 5) (x - 5)}}^{2}$ as $(x + 5) (x - 5)$ .

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Step 4.2.4.33.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(x + 5) (x - 5)}$ as ${((x + 5) (x - 5))}^{\frac{1}{2}}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - {({((x + 5) (x - 5))}^{\frac{1}{2}})}^{2}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.4.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - {((x + 5) (x - 5))}^{\frac{1}{2} \cdot 2}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.4.3

Combine $\frac{1}{2}$ and $2$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - {((x + 5) (x - 5))}^{\frac{2}{2}}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.4.4

Cancel the common factor of $2$ .

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Step 4.2.4.33.4.4.1

Cancel the common factor.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - {((x + 5) (x - 5))}^{\frac{2}{2}}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.4.4.2

Rewrite the expression.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - ((x + 5) (x - 5))}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.4.5

Simplify.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - ((x + 5) (x - 5))}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.5

Expand $(x + 5) (x - 5)$ using the FOIL Method.

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Step 4.2.4.33.5.1

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x (x - 5) + 5 (x - 5))}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.5.2

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x \cdot x + x \cdot - 5 + 5 (x - 5))}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.5.3

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5)}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.6

Combine the opposite terms in $x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5$ .

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Step 4.2.4.33.6.1

Reorder the factors in the terms $x \cdot - 5$ and $5 x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x \cdot x - 5 x + 5 x + 5 \cdot - 5)}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.6.2

Add $- 5 x$ and $5 x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x \cdot x + 0 + 5 \cdot - 5)}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.6.3

Add $x \cdot x$ and $0$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x \cdot x + 5 \cdot - 5)}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.7

Simplify each term.

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Step 4.2.4.33.7.1

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x^{2} + 5 \cdot - 5)}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.7.2

Multiply $5$ by $- 5$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - (x^{2} - 25)}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.8

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - x^{2} + 25}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.33.9

Multiply $- 1$ by $- 25$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{x^{2} - x^{2} + 25}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.34

Subtract $x^{2}$ from $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{0 + 25}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.35

Add $0$ and $25$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{25}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.36

Rewrite $25$ as $5^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{\frac{5^{2}}{x^{2}}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.37

Rewrite $\frac{5^{2}}{x^{2}}$ as ${(\frac{5}{x})}^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 \sqrt{{(\frac{5}{x})}^{2}}}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.4.38

Pull terms out from under the radical, assuming positive real numbers.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \cos (\arcsin (\frac{5}{x}))) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5

Simplify the denominator.

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Step 4.2.5.1

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{1 - {(\frac{5}{x})}^{2}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.2

Rewrite $1$ as $1^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{1^{2} - {(\frac{5}{x})}^{2}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.3

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = \frac{5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{(1 + \frac{5}{x}) (1 - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.4

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{(\frac{x}{x} + \frac{5}{x}) (1 - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.5

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{x + 5}{x} \cdot (1 - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.6

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{x + 5}{x} \cdot (\frac{x}{x} - \frac{5}{x})}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.7

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{x + 5}{x} \cdot \frac{x - 5}{x}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.8

Multiply $\frac{x + 5}{x}$ by $\frac{x - 5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{(x + 5) (x - 5)}{x \cdot x}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.9

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{(x + 5) (x - 5)}{x^{2}}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.10

Rewrite $\frac{(x + 5) (x - 5)}{x^{2}}$ as ${(\frac{1}{x})}^{2} ((x + 5) (x - 5))$ .

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Step 4.2.5.10.1

Factor the perfect power $1^{2}$ out of $(x + 5) (x - 5)$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2}}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.10.2

Factor the perfect power $x^{2}$ out of $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.10.3

Rearrange the fraction $\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \sqrt{{(\frac{1}{x})}^{2} ((x + 5) (x - 5))}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.11

Pull terms out from under the radical.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \frac{1}{x} \cdot \sqrt{(x + 5) (x - 5)}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.12

Combine $\frac{1}{x}$ and $\sqrt{(x + 5) (x - 5)}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(1 + \frac{\sqrt{(x + 5) (x - 5)}}{x}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.13

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{(\frac{x}{x} + \frac{\sqrt{(x + 5) (x - 5)}}{x}) (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.14

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \cos (\arcsin (\frac{5}{x})))}$

Step 4.2.5.15

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{1 - {(\frac{5}{x})}^{2}})}$

Step 4.2.5.16

Rewrite $1$ as $1^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{1^{2} - {(\frac{5}{x})}^{2}})}$

Step 4.2.5.17

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = \frac{5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{(1 + \frac{5}{x}) (1 - \frac{5}{x})})}$

Step 4.2.5.18

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{(\frac{x}{x} + \frac{5}{x}) (1 - \frac{5}{x})})}$

Step 4.2.5.19

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{x + 5}{x} \cdot (1 - \frac{5}{x})})}$

Step 4.2.5.20

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{x + 5}{x} \cdot (\frac{x}{x} - \frac{5}{x})})}$

Step 4.2.5.21

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{x + 5}{x} \cdot \frac{x - 5}{x}})}$

Step 4.2.5.22

Multiply $\frac{x + 5}{x}$ by $\frac{x - 5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{(x + 5) (x - 5)}{x \cdot x}})}$

Step 4.2.5.23

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{(x + 5) (x - 5)}{x^{2}}})}$

Step 4.2.5.24

Rewrite $\frac{(x + 5) (x - 5)}{x^{2}}$ as ${(\frac{1}{x})}^{2} ((x + 5) (x - 5))$ .

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Step 4.2.5.24.1

Factor the perfect power $1^{2}$ out of $(x + 5) (x - 5)$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2}}})}$

Step 4.2.5.24.2

Factor the perfect power $x^{2}$ out of $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}})}$

Step 4.2.5.24.3

Rearrange the fraction $\frac{1^{2} ((x + 5) (x - 5))}{x^{2} \cdot 1}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \sqrt{{(\frac{1}{x})}^{2} ((x + 5) (x - 5))})}$

Step 4.2.5.25

Pull terms out from under the radical.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - (\frac{1}{x} \cdot \sqrt{(x + 5) (x - 5)}))}$

Step 4.2.5.26

Combine $\frac{1}{x}$ and $\sqrt{(x + 5) (x - 5)}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (1 - \frac{\sqrt{(x + 5) (x - 5)}}{x})}$

Step 4.2.5.27

Write $1$ as a fraction with a common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot (\frac{x}{x} - \frac{\sqrt{(x + 5) (x - 5)}}{x})}$

Step 4.2.5.28

Combine the numerators over the common denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{5 (\frac{5}{x})}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot \frac{x - \sqrt{(x + 5) (x - 5)}}{x}}$

Step 4.2.6

Combine fractions.

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Step 4.2.6.1

Combine $5$ and $\frac{5}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{5 \cdot 5}{x}}{\frac{x + \sqrt{(x + 5) (x - 5)}}{x} \cdot \frac{x - \sqrt{(x + 5) (x - 5)}}{x}}$

Step 4.2.6.2

Multiply $\frac{x + \sqrt{(x + 5) (x - 5)}}{x}$ by $\frac{x - \sqrt{(x + 5) (x - 5)}}{x}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{5 \cdot 5}{x}}{\frac{(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})}{x \cdot x}}$

Step 4.2.6.3

Multiply $5$ by $5$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})}{x \cdot x}}$

Step 4.2.7

Simplify the denominator.

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Step 4.2.7.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})}{x^{1 + 1}}}$

Step 4.2.7.2

Add $1$ and $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8

Simplify the denominator.

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Step 4.2.8.1

Expand $(x + \sqrt{(x + 5) (x - 5)}) (x - \sqrt{(x + 5) (x - 5)})$ using the FOIL Method.

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Step 4.2.8.1.1

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x (x - \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} (x - \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.1.2

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x \cdot x + x (- \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} (x - \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.1.3

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x \cdot x + x (- \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} x + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.2

Combine the opposite terms in $x \cdot x + x (- \sqrt{(x + 5) (x - 5)}) + \sqrt{(x + 5) (x - 5)} x + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})$ .

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Step 4.2.8.2.1

Reorder the factors in the terms $x (- \sqrt{(x + 5) (x - 5)})$ and $\sqrt{(x + 5) (x - 5)} x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x \cdot x - x \sqrt{(x + 5) (x - 5)} + x \sqrt{(x + 5) (x - 5)} + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.2.2

Add $- x \sqrt{(x + 5) (x - 5)}$ and $x \sqrt{(x + 5) (x - 5)}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x \cdot x + 0 + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.2.3

Add $x \cdot x$ and $0$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x \cdot x + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.3

Simplify each term.

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Step 4.2.8.3.1

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} + \sqrt{(x + 5) (x - 5)} (- \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.3.2

Rewrite using the commutative property of multiplication.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - \sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)}}{x^{2}}}$

Step 4.2.8.3.3

Multiply $- \sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)}$ .

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Step 4.2.8.3.3.1

Raise $\sqrt{(x + 5) (x - 5)}$ to the power of $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (\sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.3.3.2

Raise $\sqrt{(x + 5) (x - 5)}$ to the power of $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (\sqrt{(x + 5) (x - 5)} \sqrt{(x + 5) (x - 5)})}{x^{2}}}$

Step 4.2.8.3.3.3

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - {\sqrt{(x + 5) (x - 5)}}^{1 + 1}}{x^{2}}}$

Step 4.2.8.3.3.4

Add $1$ and $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - {\sqrt{(x + 5) (x - 5)}}^{2}}{x^{2}}}$

Step 4.2.8.3.4

Rewrite ${\sqrt{(x + 5) (x - 5)}}^{2}$ as $(x + 5) (x - 5)$ .

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Step 4.2.8.3.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(x + 5) (x - 5)}$ as ${((x + 5) (x - 5))}^{\frac{1}{2}}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - {({((x + 5) (x - 5))}^{\frac{1}{2}})}^{2}}{x^{2}}}$

Step 4.2.8.3.4.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - {((x + 5) (x - 5))}^{\frac{1}{2} \cdot 2}}{x^{2}}}$

Step 4.2.8.3.4.3

Combine $\frac{1}{2}$ and $2$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - {((x + 5) (x - 5))}^{\frac{2}{2}}}{x^{2}}}$

Step 4.2.8.3.4.4

Cancel the common factor of $2$ .

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Step 4.2.8.3.4.4.1

Cancel the common factor.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - {((x + 5) (x - 5))}^{\frac{2}{2}}}{x^{2}}}$

Step 4.2.8.3.4.4.2

Rewrite the expression.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - ((x + 5) (x - 5))}{x^{2}}}$

Step 4.2.8.3.4.5

Simplify.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - ((x + 5) (x - 5))}{x^{2}}}$

Step 4.2.8.3.5

Expand $(x + 5) (x - 5)$ using the FOIL Method.

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Step 4.2.8.3.5.1

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x (x - 5) + 5 (x - 5))}{x^{2}}}$

Step 4.2.8.3.5.2

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x \cdot x + x \cdot - 5 + 5 (x - 5))}{x^{2}}}$

Step 4.2.8.3.5.3

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5)}{x^{2}}}$

Step 4.2.8.3.6

Combine the opposite terms in $x \cdot x + x \cdot - 5 + 5 x + 5 \cdot - 5$ .

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Step 4.2.8.3.6.1

Reorder the factors in the terms $x \cdot - 5$ and $5 x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x \cdot x - 5 x + 5 x + 5 \cdot - 5)}{x^{2}}}$

Step 4.2.8.3.6.2

Add $- 5 x$ and $5 x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x \cdot x + 0 + 5 \cdot - 5)}{x^{2}}}$

Step 4.2.8.3.6.3

Add $x \cdot x$ and $0$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x \cdot x + 5 \cdot - 5)}{x^{2}}}$

Step 4.2.8.3.7

Simplify each term.

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Step 4.2.8.3.7.1

Multiply $x$ by $x$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x^{2} + 5 \cdot - 5)}{x^{2}}}$

Step 4.2.8.3.7.2

Multiply $5$ by $- 5$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - (x^{2} - 25)}{x^{2}}}$

Step 4.2.8.3.8

Apply the distributive property.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - x^{2} + 25}{x^{2}}}$

Step 4.2.8.3.9

Multiply $- 1$ by $- 25$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{x^{2} - x^{2} + 25}{x^{2}}}$

Step 4.2.8.4

Subtract $x^{2}$ from $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{0 + 25}{x^{2}}}$

Step 4.2.8.5

Add $0$ and $25$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{\frac{25}{x}}{\frac{25}{x^{2}}}$

Step 4.2.9

Multiply the numerator by the reciprocal of the denominator.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{25}{x} \cdot \frac{x^{2}}{25}$

Step 4.2.10

Combine.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{25 x^{2}}{x \cdot 25}$

Step 4.2.11

Cancel the common factor of $25$ .

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Step 4.2.11.1

Cancel the common factor.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{25 x^{2}}{x \cdot 25}$

Step 4.2.11.2

Rewrite the expression.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{x^{2}}{x}$

Step 4.2.12

Cancel the common factor of $x^{2}$ and $x$ .

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Step 4.2.12.1

Factor $x$ out of $x^{2}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{x \cdot x}{x}$

Step 4.2.12.2

Cancel the common factors.

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Step 4.2.12.2.1

Raise $x$ to the power of $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{x \cdot x}{x}$

Step 4.2.12.2.2

Factor $x$ out of $x^{1}$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{x \cdot x}{x \cdot 1}$

Step 4.2.12.2.3

Cancel the common factor.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{x \cdot x}{x \cdot 1}$

Step 4.2.12.2.4

Rewrite the expression.

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = \frac{x}{1}$

Step 4.2.12.2.5

Divide $x$ by $1$ .

$f^{- 1} (\cos (\arcsin (\frac{5}{x}))) = x$

Step 4.3

Evaluate $f (f^{- 1} (x))$ .

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Step 4.3.1

Set up the composite result function.

$f (f^{- 1} (x))$

Step 4.3.2

Evaluate $f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \cos (\arcsin (\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}))$

Step 4.3.3

Write the expression using exponents.

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Step 4.3.3.1

Draw a triangle in the plane with vertices $(\sqrt{1^{2} - {(\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}^{2}}, \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})$ , $(\sqrt{1^{2} - {(\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}^{2}}, 0)$ , and the origin. Then $\arcsin (\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})$ is the angle between the positive x-axis and the ray beginning at the origin and passing through $(\sqrt{1^{2} - {(\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}^{2}}, \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})$ . Therefore, $\cos (\arcsin (\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}))$ is $\sqrt{1 - {(\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}^{2}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{1 - {(\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}^{2}}$

Step 4.3.3.2

Rewrite $1$ as $1^{2}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{1^{2} - {(\frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}^{2}}$

Step 4.3.4

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}})}$

Step 4.3.5

Simplify.

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Step 4.3.5.1

Multiply the numerator by the reciprocal of the denominator.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - (5 (\frac{(1 + x) (1 - x)}{5 \sqrt{(1 + x) (1 - x)}})))}$

Step 4.3.5.2

Cancel the common factor of $5$ .

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Step 4.3.5.2.1

Factor $5$ out of $5 \sqrt{(1 + x) (1 - x)}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - (5 (\frac{(1 + x) (1 - x)}{5 (\sqrt{(1 + x) (1 - x)})})))}$

Step 4.3.5.2.2

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - (5 (\frac{(1 + x) (1 - x)}{5 \sqrt{(1 + x) (1 - x)}})))}$

Step 4.3.5.2.3

Rewrite the expression.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}})}$

Step 4.3.5.3

Multiply $\frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}}$ by $\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - (\frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}} \cdot \frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}))}$

Step 4.3.5.4

Combine and simplify the denominator.

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Step 4.3.5.4.1

Multiply $\frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}}$ by $\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}})}$

Step 4.3.5.4.2

Raise $\sqrt{(1 + x) (1 - x)}$ to the power of $1$ .

Step 4.3.5.4.3

Raise $\sqrt{(1 + x) (1 - x)}$ to the power of $1$ .

Step 4.3.5.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1 + 1}})}$

Step 4.3.5.4.5

Add $1$ and $1$ .

Step 4.3.5.4.6

Rewrite ${\sqrt{(1 + x) (1 - x)}}^{2}$ as $(1 + x) (1 - x)$ .

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Step 4.3.5.4.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(1 + x) (1 - x)}$ as ${((1 + x) (1 - x))}^{\frac{1}{2}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{({((1 + x) (1 - x))}^{\frac{1}{2}})}^{2}})}$

Step 4.3.5.4.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{1}{2} \cdot 2}})}$

Step 4.3.5.4.6.3

Combine $\frac{1}{2}$ and $2$ .

Step 4.3.5.4.6.4

Cancel the common factor of $2$ .

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Step 4.3.5.4.6.4.1

Cancel the common factor.

Step 4.3.5.4.6.4.2

Rewrite the expression.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)})}$

Step 4.3.5.4.6.5

Simplify.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)})}$

Step 4.3.5.5

Cancel the common factor of $1 + x$ .

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Step 4.3.5.5.1

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)})}$

Step 4.3.5.5.2

Rewrite the expression.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 - x) \sqrt{(1 + x) (1 - x)}}{1 - x})}$

Step 4.3.5.6

Cancel the common factor of $1 - x$ .

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Step 4.3.5.6.1

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \frac{(1 - x) \sqrt{(1 + x) (1 - x)}}{1 - x})}$

Step 4.3.5.6.2

Divide $\sqrt{(1 + x) (1 - x)}$ by $1$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{5}{\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6

Simplify each term.

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Step 4.3.6.1

Multiply the numerator by the reciprocal of the denominator.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + 5 (\frac{(1 + x) (1 - x)}{5 \sqrt{(1 + x) (1 - x)}})) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.2

Cancel the common factor of $5$ .

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Step 4.3.6.2.1

Factor $5$ out of $5 \sqrt{(1 + x) (1 - x)}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + 5 (\frac{(1 + x) (1 - x)}{5 (\sqrt{(1 + x) (1 - x)})})) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.2.2

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + 5 (\frac{(1 + x) (1 - x)}{5 \sqrt{(1 + x) (1 - x)}})) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.2.3

Rewrite the expression.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.3

Multiply $\frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}}$ by $\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}} \cdot \frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4

Combine and simplify the denominator.

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Step 4.3.6.4.1

Multiply $\frac{(1 + x) (1 - x)}{\sqrt{(1 + x) (1 - x)}}$ by $\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.2

Raise $\sqrt{(1 + x) (1 - x)}$ to the power of $1$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.3

Raise $\sqrt{(1 + x) (1 - x)}$ to the power of $1$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1 + 1}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.5

Add $1$ and $1$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{2}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.6

Rewrite ${\sqrt{(1 + x) (1 - x)}}^{2}$ as $(1 + x) (1 - x)$ .

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Step 4.3.6.4.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(1 + x) (1 - x)}$ as ${((1 + x) (1 - x))}^{\frac{1}{2}}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{({((1 + x) (1 - x))}^{\frac{1}{2}})}^{2}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{1}{2} \cdot 2}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.6.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.6.4

Cancel the common factor of $2$ .

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Step 4.3.6.4.6.4.1

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.6.4.2

Rewrite the expression.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.4.6.5

Simplify.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.5

Cancel the common factor of $1 + x$ .

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Step 4.3.6.5.1

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 + x) (1 - x) \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.5.2

Rewrite the expression.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 - x) \sqrt{(1 + x) (1 - x)}}{1 - x}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.6

Cancel the common factor of $1 - x$ .

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Step 4.3.6.6.1

Cancel the common factor.

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \frac{(1 - x) \sqrt{(1 + x) (1 - x)}}{1 - x}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.3.6.6.2

Divide $\sqrt{(1 + x) (1 - x)}$ by $1$ .

$f (\frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}) = \sqrt{(1 + \sqrt{(1 + x) (1 - x)}) (1 - \sqrt{(1 + x) (1 - x)})}$

Step 4.4

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = \frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}$ is the inverse of $f (x) = \cos (\arcsin (\frac{5}{x}))$ .

$f^{- 1} (x) = \frac{5 \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}$