Trigonometry Examples

$\frac{\sin (x)}{1 + \cos (x)} + \frac{1 + \cos (x)}{\sin (x)}$

Step 1

The polynomial cannot be factored using the grouping method. Try a different method, or if you aren't sure, choose Factor.

The polynomial cannot be factored using the grouping method.

Step 2

To write $\frac{\sin (x)}{1 + \cos (x)}$ as a fraction with a common denominator, multiply by $\frac{\sin (x)}{\sin (x)}$ .

$\frac{\sin (x)}{1 + \cos (x)} \cdot \frac{\sin (x)}{\sin (x)} + \frac{1 + \cos (x)}{\sin (x)}$

Step 3

To write $\frac{1 + \cos (x)}{\sin (x)}$ as a fraction with a common denominator, multiply by $\frac{1 + \cos (x)}{1 + \cos (x)}$ .

$\frac{\sin (x)}{1 + \cos (x)} \cdot \frac{\sin (x)}{\sin (x)} + \frac{1 + \cos (x)}{\sin (x)} \cdot \frac{1 + \cos (x)}{1 + \cos (x)}$

Step 4

Write each expression with a common denominator of $(1 + \cos (x)) \sin (x)$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{\sin (x)}{1 + \cos (x)}$ by $\frac{\sin (x)}{\sin (x)}$ .

$\frac{\sin (x) \sin (x)}{(1 + \cos (x)) \sin (x)} + \frac{1 + \cos (x)}{\sin (x)} \cdot \frac{1 + \cos (x)}{1 + \cos (x)}$

Step 4.2

Multiply $\frac{1 + \cos (x)}{\sin (x)}$ by $\frac{1 + \cos (x)}{1 + \cos (x)}$ .

$\frac{\sin (x) \sin (x)}{(1 + \cos (x)) \sin (x)} + \frac{(1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 4.3

Reorder the factors of $(1 + \cos (x)) \sin (x)$ .

$\frac{\sin (x) \sin (x)}{\sin (x) (1 + \cos (x))} + \frac{(1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 5

Combine the numerators over the common denominator.

$\frac{\sin (x) \sin (x) + (1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6

Rewrite $\frac{\sin (x) \sin (x) + (1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$ in a factored form.

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Step 6.1

Multiply $\sin (x) \sin (x)$ .

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Step 6.1.1

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

$\frac{\sin^{1} (x) \sin (x) + (1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.1.2

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

$\frac{\sin^{1} (x) \sin^{1} (x) + (1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.1.3

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

$\frac{{\sin (x)}^{1 + 1} + (1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.1.4

Add $1$ and $1$ .

$\frac{\sin^{2} (x) + (1 + \cos (x)) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.2

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

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Step 6.2.1

Apply the distributive property.

$\frac{\sin^{2} (x) + 1 (1 + \cos (x)) + \cos (x) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.2.2

Apply the distributive property.

$\frac{\sin^{2} (x) + 1 \cdot 1 + 1 \cos (x) + \cos (x) (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.2.3

Apply the distributive property.

$\frac{\sin^{2} (x) + 1 \cdot 1 + 1 \cos (x) + \cos (x) \cdot 1 + \cos (x) \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3

Simplify and combine like terms.

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Step 6.3.1

Simplify each term.

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Step 6.3.1.1

Multiply $1$ by $1$ .

$\frac{\sin^{2} (x) + 1 + 1 \cos (x) + \cos (x) \cdot 1 + \cos (x) \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3.1.2

Multiply $\cos (x)$ by $1$ .

$\frac{\sin^{2} (x) + 1 + \cos (x) + \cos (x) \cdot 1 + \cos (x) \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3.1.3

Multiply $\cos (x)$ by $1$ .

$\frac{\sin^{2} (x) + 1 + \cos (x) + \cos (x) + \cos (x) \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3.1.4

Multiply $\cos (x) \cos (x)$ .

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Step 6.3.1.4.1

Raise $\cos (x)$ to the power of $1$ .

$\frac{\sin^{2} (x) + 1 + \cos (x) + \cos (x) + \cos^{1} (x) \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3.1.4.2

Raise $\cos (x)$ to the power of $1$ .

$\frac{\sin^{2} (x) + 1 + \cos (x) + \cos (x) + \cos^{1} (x) \cos^{1} (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3.1.4.3

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

$\frac{\sin^{2} (x) + 1 + \cos (x) + \cos (x) + {\cos (x)}^{1 + 1}}{\sin (x) (1 + \cos (x))}$

Step 6.3.1.4.4

Add $1$ and $1$ .

$\frac{\sin^{2} (x) + 1 + \cos (x) + \cos (x) + \cos^{2} (x)}{\sin (x) (1 + \cos (x))}$

Step 6.3.2

Add $\cos (x)$ and $\cos (x)$ .

$\frac{\sin^{2} (x) + 1 + 2 \cos (x) + \cos^{2} (x)}{\sin (x) (1 + \cos (x))}$

Step 6.4

Rewrite $\sin^{2} (x) + 1 + 2 \cos (x) + \cos^{2} (x)$ in a factored form.

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Step 6.4.1

Regroup terms.

$\frac{\sin^{2} (x) + \cos^{2} (x) + 1 + 2 \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.4.2

Apply pythagorean identity.

$\frac{1 + 1 + 2 \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.4.3

Add $1$ and $1$ .

$\frac{2 + 2 \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.4.4

Factor $2$ out of $2 + 2 \cos (x)$ .

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Step 6.4.4.1

Factor $2$ out of $2$ .

$\frac{2 \cdot 1 + 2 \cos (x)}{\sin (x) (1 + \cos (x))}$

Step 6.4.4.2

Factor $2$ out of $2 \cdot 1 + 2 \cos (x)$ .

$\frac{2 \cdot (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.4.4.3

Multiply $2$ by $1 + \cos (x)$ .

$\frac{2 (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.5

Reduce the expression $\frac{2 (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$ by cancelling the common factors.

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Step 6.5.1

Cancel the common factor.

$\frac{2 (1 + \cos (x))}{\sin (x) (1 + \cos (x))}$

Step 6.5.2

Rewrite the expression.

$\frac{2}{\sin (x)}$