Trigonometry Examples

$\tan (\arcsin (x))$

Step 1

Interchange the variables.

$x = \tan (\arcsin (y))$

Step 2

Solve for $y$ .

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Step 2.1

Rewrite the equation as $\tan (\arcsin (y)) = x$ .

$\tan (\arcsin (y)) = x$

Step 2.2

Take the inverse tangent of both sides of the equation to extract $\arcsin (y)$ from inside the tangent.

$\arcsin (y) = \arctan (x)$

Step 2.3

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

$y = \sin (\arctan (x))$

Step 2.4

Simplify the right side.

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Step 2.4.1

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

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Step 2.4.1.1

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

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

Step 2.4.1.2

Multiply $\frac{x}{\sqrt{1 + x^{2}}}$ by $\frac{\sqrt{1 + x^{2}}}{\sqrt{1 + x^{2}}}$ .

$y = \frac{x}{\sqrt{1 + x^{2}}} \cdot \frac{\sqrt{1 + x^{2}}}{\sqrt{1 + x^{2}}}$

Step 2.4.1.3

Combine and simplify the denominator.

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Step 2.4.1.3.1

Multiply $\frac{x}{\sqrt{1 + x^{2}}}$ by $\frac{\sqrt{1 + x^{2}}}{\sqrt{1 + x^{2}}}$ .

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

Step 2.4.1.3.2

Raise $\sqrt{1 + x^{2}}$ to the power of $1$ .

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

Step 2.4.1.3.3

Raise $\sqrt{1 + x^{2}}$ to the power of $1$ .

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

Step 2.4.1.3.4

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

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

Step 2.4.1.3.5

Add $1$ and $1$ .

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

Step 2.4.1.3.6

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

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Step 2.4.1.3.6.1

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

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

Step 2.4.1.3.6.2

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

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

Step 2.4.1.3.6.3

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

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

Step 2.4.1.3.6.4

Cancel the common factor of $2$ .

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Step 2.4.1.3.6.4.1

Cancel the common factor.

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

Step 2.4.1.3.6.4.2

Rewrite the expression.

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

Step 2.4.1.3.6.5

Simplify.

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

Step 3

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

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

Step 4

Verify if $f^{- 1} (x) = \frac{x \sqrt{1 + x^{2}}}{1 + x^{2}}$ is the inverse of $f (x) = \tan (\arcsin (x))$ .

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

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

Step 4.2.3

Rearrange terms.

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

Step 4.2.4

Apply pythagorean identity.

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

Step 4.2.5

Factor $\sec (\arcsin (x))$ out of $\sec^{2} (\arcsin (x))$ .

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

Step 4.2.6

Separate fractions.

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

Step 4.2.7

Rewrite $\sec (\arcsin (x))$ in terms of sines and cosines.

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

Step 4.2.8

Rewrite $\tan (\arcsin (x))$ in terms of sines and cosines.

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

Step 4.2.9

Multiply by the reciprocal of the fraction to divide by $\frac{1}{\cos (\arcsin (x))}$ .

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

Step 4.2.10

Reduce the expression by cancelling the common factors.

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Step 4.2.10.1

Write $\cos (\arcsin (x))$ as a fraction with denominator $1$ .

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

Step 4.2.10.2

Cancel the common factor of $\cos (\arcsin (x))$ .

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Step 4.2.10.2.1

Cancel the common factor.

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

Step 4.2.10.2.2

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \tan^{2} (\arcsin (x))}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11

Simplify the numerator.

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Step 4.2.11.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x}{\sqrt{1 - x^{2}}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.2

Simplify the denominator.

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Step 4.2.11.2.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x}{\sqrt{1^{2} - x^{2}}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.2.2

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 $b = x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x}{\sqrt{(1 + x) (1 - x)}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.3

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x}{\sqrt{(1 + x) (1 - x)}} \cdot \frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4

Combine and simplify the denominator.

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Step 4.2.11.4.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.2

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.3

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.4

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1 + 1}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.5

Add $1$ and $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{2}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.6

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

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Step 4.2.11.4.6.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{{({((1 + x) (1 - x))}^{\frac{1}{2}})}^{2}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.6.2

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{1}{2} \cdot 2}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.6.3

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.6.4

Cancel the common factor of $2$ .

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Step 4.2.11.4.6.4.1

Cancel the common factor.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.6.4.2

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.4.6.5

Simplify.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + {(\frac{x \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.5

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 4.2.11.5.1

Apply the product rule to $\frac{x \sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{{(x \sqrt{(1 + x) (1 - x)})}^{2}}{{((1 + x) (1 - x))}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.5.2

Apply the product rule to $x \sqrt{(1 + x) (1 - x)}$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} {\sqrt{(1 + x) (1 - x)}}^{2}}{{((1 + x) (1 - x))}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.5.3

Apply the product rule to $(1 + x) (1 - x)$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} {\sqrt{(1 + x) (1 - x)}}^{2}}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6

Simplify the numerator.

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Step 4.2.11.6.1

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

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Step 4.2.11.6.1.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} {({((1 + x) (1 - x))}^{\frac{1}{2}})}^{2}}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.1.2

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} {((1 + x) (1 - x))}^{\frac{1}{2} \cdot 2}}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.1.3

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} {((1 + x) (1 - x))}^{\frac{2}{2}}}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.1.4

Cancel the common factor of $2$ .

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Step 4.2.11.6.1.4.1

Cancel the common factor.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} {((1 + x) (1 - x))}^{\frac{2}{2}}}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.1.4.2

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} ((1 + x) (1 - x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.1.5

Simplify.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} ((1 + x) (1 - x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.2

Expand $(1 + x) (1 - x)$ using the FOIL Method.

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Step 4.2.11.6.2.1

Apply the distributive property.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 (1 - x) + x (1 - x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.2.2

Apply the distributive property.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 \cdot 1 + 1 (- x) + x (1 - x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.2.3

Apply the distributive property.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 \cdot 1 + 1 (- x) + x \cdot 1 + x (- x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3

Simplify and combine like terms.

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Step 4.2.11.6.3.1

Simplify each term.

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Step 4.2.11.6.3.1.1

Multiply $1$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 + 1 (- x) + x \cdot 1 + x (- x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.1.2

Multiply $- x$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x + x \cdot 1 + x (- x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.1.3

Multiply $x$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x + x + x (- x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.1.4

Rewrite using the commutative property of multiplication.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x + x - x \cdot x)}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.1.5

Multiply $x$ by $x$ by adding the exponents.

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Step 4.2.11.6.3.1.5.1

Move $x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x + x - (x \cdot x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.1.5.2

Multiply $x$ by $x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x + x - x^{2})}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.2

Add $- x$ and $x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 + 0 - x^{2})}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.3.3

Add $1$ and $0$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x^{2})}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.4

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1^{2} - x^{2})}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.6.5

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 $b = x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 + x) (1 - x)}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.7

Cancel the common factor of $1 + x$ and ${(1 + x)}^{2}$ .

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Step 4.2.11.7.1

Factor $1 + x$ out of $x^{2} (1 + x) (1 - x)$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{(1 + x) (x^{2} (1 - x))}{{(1 + x)}^{2} {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.7.2

Cancel the common factors.

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Step 4.2.11.7.2.1

Factor $1 + x$ out of ${(1 + x)}^{2} {(1 - x)}^{2}$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{(1 + x) (x^{2} (1 - x))}{(1 + x) ((1 + x) {(1 - x)}^{2})}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.7.2.2

Cancel the common factor.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{(1 + x) (x^{2} (1 - x))}{(1 + x) ((1 + x) {(1 - x)}^{2})}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.7.2.3

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2} (1 - x)}{(1 + x) {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.8

Cancel the common factor of $1 - x$ and ${(1 - x)}^{2}$ .

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Step 4.2.11.8.1

Factor $1 - x$ out of $x^{2} (1 - x)$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{(1 - x) x^{2}}{(1 + x) {(1 - x)}^{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.8.2

Cancel the common factors.

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Step 4.2.11.8.2.1

Factor $1 - x$ out of $(1 + x) {(1 - x)}^{2}$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{(1 - x) x^{2}}{(1 - x) ((1 + x) (1 - x))}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.8.2.2

Cancel the common factor.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{(1 - x) x^{2}}{(1 - x) ((1 + x) (1 - x))}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.8.2.3

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{1 + \frac{x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.9

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{(1 + x) (1 - x)}{(1 + x) (1 - x)} + \frac{x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.10

Combine the numerators over the common denominator.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{(1 + x) (1 - x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11

Simplify the numerator.

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Step 4.2.11.11.1

Expand $(1 + x) (1 - x)$ using the FOIL Method.

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Step 4.2.11.11.1.1

Apply the distributive property.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 (1 - x) + x (1 - x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.1.2

Apply the distributive property.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 \cdot 1 + 1 (- x) + x (1 - x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.1.3

Apply the distributive property.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 \cdot 1 + 1 (- x) + x \cdot 1 + x (- x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2

Simplify and combine like terms.

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Step 4.2.11.11.2.1

Simplify each term.

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Step 4.2.11.11.2.1.1

Multiply $1$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 + 1 (- x) + x \cdot 1 + x (- x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.1.2

Multiply $- x$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 - x + x \cdot 1 + x (- x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.1.3

Multiply $x$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 - x + x + x (- x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.1.4

Rewrite using the commutative property of multiplication.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 - x + x - x \cdot x + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.1.5

Multiply $x$ by $x$ by adding the exponents.

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Step 4.2.11.11.2.1.5.1

Move $x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 - x + x - (x \cdot x) + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.1.5.2

Multiply $x$ by $x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 - x + x - x^{2} + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.2

Add $- x$ and $x$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 + 0 - x^{2} + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.2.3

Add $1$ and $0$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 - x^{2} + x^{2}}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.3

Add $- x^{2}$ and $x^{2}$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1 + 0}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.11.4

Add $1$ and $0$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\sqrt{\frac{1}{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.12

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{1}}{\sqrt{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.13

Any root of $1$ is $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{1}{\sqrt{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.14

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{1}{\sqrt{(1 + x) (1 - x)}} \cdot \frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15

Combine and simplify the denominator.

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Step 4.2.11.15.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.2

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.3

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{\sqrt{(1 + x) (1 - x)} \sqrt{(1 + x) (1 - x)}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.4

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{1 + 1}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.5

Add $1$ and $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{{\sqrt{(1 + x) (1 - x)}}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.6

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

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Step 4.2.11.15.6.1

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{{({((1 + x) (1 - x))}^{\frac{1}{2}})}^{2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.6.2

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{1}{2} \cdot 2}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.6.3

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

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.6.4

Cancel the common factor of $2$ .

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Step 4.2.11.15.6.4.1

Cancel the common factor.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{{((1 + x) (1 - x))}^{\frac{2}{2}}}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.6.4.2

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.11.15.6.5

Simplify.

$f^{- 1} (\tan (\arcsin (x))) = \frac{\frac{\sqrt{(1 + x) (1 - x)}}{(1 + x) (1 - x)}}{\sec (\arcsin (x))} \cdot \sin (\arcsin (x))$

Step 4.2.12

Simplify the denominator.

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Step 4.2.12.1

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

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

Step 4.2.12.2

Simplify the denominator.

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Step 4.2.12.2.1

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

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

Step 4.2.12.2.2

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 $b = x$ .

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

Step 4.2.12.3

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

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

Step 4.2.12.4

Combine and simplify the denominator.

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Step 4.2.12.4.1

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

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

Step 4.2.12.4.2

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

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

Step 4.2.12.4.3

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

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

Step 4.2.12.4.4

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

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

Step 4.2.12.4.5

Add $1$ and $1$ .

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

Step 4.2.12.4.6

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

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Step 4.2.12.4.6.1

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

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

Step 4.2.12.4.6.2

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

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

Step 4.2.12.4.6.3

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

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

Step 4.2.12.4.6.4

Cancel the common factor of $2$ .

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Step 4.2.12.4.6.4.1

Cancel the common factor.

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

Step 4.2.12.4.6.4.2

Rewrite the expression.

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

Step 4.2.12.4.6.5

Simplify.

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

Step 4.2.13

Reduce the expression by cancelling the common factors.

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Step 4.2.13.1

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

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Step 4.2.13.1.1

Cancel the common factor.

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

Step 4.2.13.1.2

Rewrite the expression.

$f^{- 1} (\tan (\arcsin (x))) = 1 \sin (\arcsin (x))$

Step 4.2.13.2

Multiply $\sin (\arcsin (x))$ by $1$ .

$f^{- 1} (\tan (\arcsin (x))) = \sin (\arcsin (x))$

Step 4.2.14

The functions sine and arcsine are inverses.

$f^{- 1} (\tan (\arcsin (x))) = x$

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 $f (\frac{x \sqrt{1 + x^{2}}}{1 + x^{2}})$ by substituting in the value of $f^{- 1}$ into $f$ .

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

Step 4.3.3

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

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

Step 4.3.4

Multiply the numerator by the reciprocal of the denominator.

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

Step 4.3.5

Simplify the denominator.

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Step 4.3.5.1

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

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

Step 4.3.5.2

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 $b = \frac{x \sqrt{1 + x^{2}}}{1 + x^{2}}$ .

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

Step 4.3.5.3

Simplify.

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Step 4.3.5.3.1

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

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

Step 4.3.5.3.2

Combine the numerators over the common denominator.

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

Step 4.3.5.3.3

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

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

Step 4.3.5.3.4

Combine the numerators over the common denominator.

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

Step 4.3.5.4

Multiply $\frac{1 + x^{2} + x \sqrt{1 + x^{2}}}{1 + x^{2}}$ by $\frac{1 + x^{2} - x \sqrt{1 + x^{2}}}{1 + x^{2}}$ .

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

Step 4.3.5.5

Simplify the denominator.

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Step 4.3.5.5.1

Raise $1 + x^{2}$ to the power of $1$ .

Step 4.3.5.5.2

Raise $1 + x^{2}$ to the power of $1$ .

Step 4.3.5.5.3

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

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

Step 4.3.5.5.4

Add $1$ and $1$ .

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

Step 4.3.5.6

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

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Step 4.3.5.6.1

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

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

Step 4.3.5.6.2

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

Step 4.3.5.6.3

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

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

Step 4.3.5.7

Pull terms out from under the radical.

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

Step 4.3.5.8

Combine $\frac{1}{1 + x^{2}}$ and $\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}$ .

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

Step 4.3.6

Multiply the numerator by the reciprocal of the denominator.

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

Step 4.3.7

Multiply $\frac{1 + x^{2}}{\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}}$ by $1$ .

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

Step 4.3.8

Cancel the common factor of $1 + x^{2}$ .

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Step 4.3.8.1

Cancel the common factor.

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

Step 4.3.8.2

Rewrite the expression.

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

Step 4.3.9

Combine $\frac{1}{\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}}$ and $x$ .

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

Step 4.3.10

Combine $\frac{x}{\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}}$ and $\sqrt{1 + x^{2}}$ .

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

Step 4.3.11

Multiply $\frac{x \sqrt{1 + x^{2}}}{\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}}$ by $\frac{\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}}{\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}}$ .

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

Step 4.3.12

Combine and simplify the denominator.

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Step 4.3.12.1

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

Step 4.3.12.2

Raise $\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}$ to the power of $1$ .

Step 4.3.12.3

Raise $\sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}$ to the power of $1$ .

Step 4.3.12.4

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

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

Step 4.3.12.5

Add $1$ and $1$ .

Step 4.3.12.6

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

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Step 4.3.12.6.1

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

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

Step 4.3.12.6.2

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

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

Step 4.3.12.6.3

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

Step 4.3.12.6.4

Cancel the common factor of $2$ .

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Step 4.3.12.6.4.1

Cancel the common factor.

Step 4.3.12.6.4.2

Rewrite the expression.

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

Step 4.3.12.6.5

Simplify.

Step 4.3.13

Combine using the product rule for radicals.

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

Step 4.3.14

Multiply $\frac{x \sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}}) (1 + x^{2})}}{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}})}$ by $\frac{1 + x^{2} - x \sqrt{1 + x^{2}}}{1 + x^{2} - x \sqrt{1 + x^{2}}}$ .

Step 4.3.15

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

Step 4.3.16

Reorder.

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Step 4.3.16.1

Move $1 + x^{2} + x \sqrt{1 + x^{2}}$ .

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

Step 4.3.16.2

Expand the denominator using the FOIL method.

$f (\frac{x \sqrt{1 + x^{2}}}{1 + x^{2}}) = \frac{x \sqrt{(1 + x^{2} + x \sqrt{1 + x^{2}}) (1 + x^{2} - x \sqrt{1 + x^{2}}) (1 + x^{2})} (1 + x^{2} - x \sqrt{1 + x^{2}})}{(1 + x^{2} - x \sqrt{1 + x^{2}}) (1 + x^{2} - (x \sqrt{1 + x^{2}}) + x^{2} + x^{4} + x^{3} (- \sqrt{1 + x^{2}}) + x \sqrt{1 + x^{2}} + x^{3} \sqrt{1 + x^{2}} + x^{2} (- {\sqrt{1 + x^{2}}}^{2}))}$

Step 4.3.16.3

Simplify.

Step 4.3.17

Cancel the common factor of $1 + x^{2} - x \sqrt{1 + x^{2}}$ .

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Step 4.3.17.1

Cancel the common factor.

Step 4.3.17.2

Rewrite the expression.

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

Step 4.4

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = \frac{x \sqrt{1 + x^{2}}}{1 + x^{2}}$ is the inverse of $f (x) = \tan (\arcsin (x))$ .

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