Trigonometry Examples

$\frac{\sin^{2} (x - 9)}{2 \cos (x + 1)} \cdot \frac{10 \cos (x + 5)}{3 \sin (x + 9)}$

Step 1

Combine.

$\frac{\sin^{2} (x - 9) (10 \cos (x + 5))}{2 \cos (x + 1) (3 \sin (x + 9))}$

Step 2

Cancel the common factor of $10$ and $2$ .

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Step 2.1

Factor $2$ out of $\sin^{2} (x - 9) (10 \cos (x + 5))$ .

$\frac{2 (\sin^{2} (x - 9) (5 \cos (x + 5)))}{2 \cos (x + 1) (3 \sin (x + 9))}$

Step 2.2

Cancel the common factors.

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Step 2.2.1

Factor $2$ out of $2 \cos (x + 1) (3 \sin (x + 9))$ .

$\frac{2 (\sin^{2} (x - 9) (5 \cos (x + 5)))}{2 (\cos (x + 1) (3 \sin (x + 9)))}$

Step 2.2.2

Cancel the common factor.

$\frac{2 (\sin^{2} (x - 9) (5 \cos (x + 5)))}{2 (\cos (x + 1) (3 \sin (x + 9)))}$

Step 2.2.3

Rewrite the expression.

$\frac{\sin^{2} (x - 9) (5 \cos (x + 5))}{\cos (x + 1) (3 \sin (x + 9))}$

Step 3

Factor $\sin (x - 9)$ out of $\sin^{2} (x - 9)$ .

$\frac{\sin (x - 9) \sin (x - 9) (5 \cos (x + 5))}{\cos (x + 1) (3 \sin (x + 9))}$

Step 4

Separate fractions.

$\frac{\sin (x - 9) (5 \cos (x + 5))}{3 \sin (x + 9)} \cdot \frac{\sin (x - 9)}{\cos (x + 1)}$

Step 5

Rewrite $\frac{\sin (x - 9)}{\cos (x + 1)}$ as a product.

$\frac{\sin (x - 9) (5 \cos (x + 5))}{3 \sin (x + 9)} (\sin (x - 9) \frac{1}{\cos (x + 1)})$

Step 6

Write $\sin (x - 9)$ as a fraction with denominator $1$ .

$\frac{\sin (x - 9) (5 \cos (x + 5))}{3 \sin (x + 9)} (\frac{\sin (x - 9)}{1} \cdot \frac{1}{\cos (x + 1)})$

Step 7

Simplify.

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Step 7.1

Divide $\sin (x - 9)$ by $1$ .

$\frac{\sin (x - 9) (5 \cos (x + 5))}{3 \sin (x + 9)} (\sin (x - 9) \frac{1}{\cos (x + 1)})$

Step 7.2

Convert from $\frac{1}{\cos (x + 1)}$ to $\sec (x + 1)$ .

$\frac{\sin (x - 9) (5 \cos (x + 5))}{3 \sin (x + 9)} (\sin (x - 9) \sec (x + 1))$

Step 8

Separate fractions.

$\frac{5 \cos (x + 5)}{3} \cdot \frac{\sin (x - 9)}{\sin (x + 9)} (\sin (x - 9) \sec (x + 1))$

Step 9

Rewrite $\frac{\sin (x - 9)}{\sin (x + 9)}$ as a product.

$\frac{5 \cos (x + 5)}{3} (\sin (x - 9) \frac{1}{\sin (x + 9)}) (\sin (x - 9) \sec (x + 1))$

Step 10

Write $\sin (x - 9)$ as a fraction with denominator $1$ .

$\frac{5 \cos (x + 5)}{3} (\frac{\sin (x - 9)}{1} \cdot \frac{1}{\sin (x + 9)}) (\sin (x - 9) \sec (x + 1))$

Step 11

Simplify.

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Step 11.1

Divide $\sin (x - 9)$ by $1$ .

$\frac{5 \cos (x + 5)}{3} (\sin (x - 9) \frac{1}{\sin (x + 9)}) (\sin (x - 9) \sec (x + 1))$

Step 11.2

Convert from $\frac{1}{\sin (x + 9)}$ to $\csc (x + 9)$ .

$\frac{5 \cos (x + 5)}{3} (\sin (x - 9) \csc (x + 9)) (\sin (x - 9) \sec (x + 1))$

Step 12

Multiply $\frac{5 \cos (x + 5)}{3} (\sin (x - 9) \csc (x + 9))$ .

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Step 12.1

Combine $\sin (x - 9)$ and $\frac{5 \cos (x + 5)}{3}$ .

$\frac{\sin (x - 9) (5 \cos (x + 5))}{3} \csc (x + 9) (\sin (x - 9) \sec (x + 1))$

Step 12.2

Combine $\frac{\sin (x - 9) (5 \cos (x + 5))}{3}$ and $\csc (x + 9)$ .

$\frac{\sin (x - 9) (5 \cos (x + 5)) \csc (x + 9)}{3} (\sin (x - 9) \sec (x + 1))$

Step 13

Move $5$ to the left of $\sin (x - 9)$ .

$\frac{5 \cdot \sin (x - 9) \cos (x + 5) \csc (x + 9)}{3} (\sin (x - 9) \sec (x + 1))$

Step 14

Multiply $\frac{5 \sin (x - 9) \cos (x + 5) \csc (x + 9)}{3} (\sin (x - 9) \sec (x + 1))$ .

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Step 14.1

Combine $\sin (x - 9)$ and $\frac{5 \sin (x - 9) \cos (x + 5) \csc (x + 9)}{3}$ .

$\frac{\sin (x - 9) (5 \sin (x - 9) \cos (x + 5) \csc (x + 9))}{3} \sec (x + 1)$

Step 14.2

Raise $\sin (x - 9)$ to the power of $1$ .

$\frac{5 (\sin^{1} (x - 9) \sin (x - 9)) \cos (x + 5) \csc (x + 9)}{3} \sec (x + 1)$

Step 14.3

Raise $\sin (x - 9)$ to the power of $1$ .

$\frac{5 (\sin^{1} (x - 9) \sin^{1} (x - 9)) \cos (x + 5) \csc (x + 9)}{3} \sec (x + 1)$

Step 14.4

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

$\frac{5 {\sin (x - 9)}^{1 + 1} \cos (x + 5) \csc (x + 9)}{3} \sec (x + 1)$

Step 14.5

Add $1$ and $1$ .

$\frac{5 \sin^{2} (x - 9) \cos (x + 5) \csc (x + 9)}{3} \sec (x + 1)$

Step 14.6

Combine $\frac{5 \sin^{2} (x - 9) \cos (x + 5) \csc (x + 9)}{3}$ and $\sec (x + 1)$ .

$\frac{5 \sin^{2} (x - 9) \cos (x + 5) \csc (x + 9) \sec (x + 1)}{3}$