Trigonometry Examples

$\cos (35) = \frac{9}{x}$

Step 1

Rewrite the equation as $\frac{9}{x} = \cos (35)$ .

$\frac{9}{x} = \cos (35)$

Step 2

Evaluate $\cos (35)$ .

$\frac{9}{x} = 0.81915204$

Step 3

Find the LCD of the terms in the equation.

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Step 3.1

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

$x, 1$

Step 3.2

The LCM of one and any expression is the expression.

$x$

Step 4

Multiply each term in $\frac{9}{x} = 0.81915204$ by $x$ to eliminate the fractions.

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Step 4.1

Multiply each term in $\frac{9}{x} = 0.81915204$ by $x$ .

$\frac{9}{x} x = 0.81915204 x$

Step 4.2

Simplify the left side.

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Step 4.2.1

Cancel the common factor of $x$ .

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Step 4.2.1.1

Cancel the common factor.

$\frac{9}{x} x = 0.81915204 x$

Step 4.2.1.2

Rewrite the expression.

$9 = 0.81915204 x$

Step 5

Solve the equation.

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Step 5.1

Rewrite the equation as $0.81915204 x = 9$ .

$0.81915204 x = 9$

Step 5.2

Divide each term in $0.81915204 x = 9$ by $0.81915204$ and simplify.

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Step 5.2.1

Divide each term in $0.81915204 x = 9$ by $0.81915204$ .

$\frac{0.81915204 x}{0.81915204} = \frac{9}{0.81915204}$

Step 5.2.2

Simplify the left side.

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Step 5.2.2.1

Cancel the common factor of $0.81915204$ .

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Step 5.2.2.1.1

Cancel the common factor.

$\frac{0.81915204 x}{0.81915204} = \frac{9}{0.81915204}$

Step 5.2.2.1.2

Divide $x$ by $1$ .

$x = \frac{9}{0.81915204}$

Step 5.2.3

Simplify the right side.

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Step 5.2.3.1

Divide $9$ by $0.81915204$ .

$x = 10.98697129$