Precalculus Examples

$\cos (x) + \tan (x) \cdot \sin (x)$

Simplify each term.

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

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

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

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Combine $\frac{\sin (x)}{\cos (x)}$ and $\sin (x)$ .

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

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

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

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

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

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

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

Add $1$ and $1$ .

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

Simplify each term.

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

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

Separate fractions.

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

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

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

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

$\cos (x) + \sin (x) \tan (x)$

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