Algebra Examples

$\tan (6 x)$

Step 1

Factor $2$ out of $6 x$ .

$\tan (2 (3 x))$

Step 2

Simplify the numerator.

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Step 2.1

Apply the tangent triple-angle identity.

$\frac{2 \frac{3 \tan (x) - \tan^{3} (x)}{1 - 3 \tan^{2} (x)}}{1 - \tan^{2} (3 x)}$

Step 2.2

Factor $\tan (x)$ out of $3 \tan (x) - \tan^{3} (x)$ .

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Step 2.2.1

Factor $\tan (x)$ out of $3 \tan (x)$ .

$\frac{2 \frac{\tan (x) \cdot 3 - \tan^{3} (x)}{1 - 3 \tan^{2} (x)}}{1 - \tan^{2} (3 x)}$

Step 2.2.2

Factor $\tan (x)$ out of $- \tan^{3} (x)$ .

$\frac{2 \frac{\tan (x) \cdot 3 + \tan (x) (- \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{1 - \tan^{2} (3 x)}$

Step 2.2.3

Factor $\tan (x)$ out of $\tan (x) \cdot 3 + \tan (x) (- \tan^{2} (x))$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{1 - \tan^{2} (3 x)}$

Step 3

Simplify the denominator.

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Step 3.1

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

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{1^{2} - \tan^{2} (3 x)}$

Step 3.2

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 $b = \tan (3 x)$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \tan (3 x)) (1 - \tan (3 x))}$

Step 3.3

Simplify.

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Step 3.3.1

Apply the tangent triple-angle identity.

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{3 \tan (x) - \tan^{3} (x)}{1 - 3 \tan^{2} (x)}) (1 - \tan (3 x))}$

Step 3.3.2

Factor $\tan (x)$ out of $3 \tan (x) - \tan^{3} (x)$ .

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Step 3.3.2.1

Factor $\tan (x)$ out of $3 \tan (x)$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) \cdot 3 - \tan^{3} (x)}{1 - 3 \tan^{2} (x)}) (1 - \tan (3 x))}$

Step 3.3.2.2

Factor $\tan (x)$ out of $- \tan^{3} (x)$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) \cdot 3 + \tan (x) (- \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \tan (3 x))}$

Step 3.3.2.3

Factor $\tan (x)$ out of $\tan (x) \cdot 3 + \tan (x) (- \tan^{2} (x))$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \tan (3 x))}$

Step 3.3.3

Apply the tangent triple-angle identity.

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{3 \tan (x) - \tan^{3} (x)}{1 - 3 \tan^{2} (x)})}$

Step 3.3.4

Factor $\tan (x)$ out of $3 \tan (x) - \tan^{3} (x)$ .

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Step 3.3.4.1

Factor $\tan (x)$ out of $3 \tan (x)$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) \cdot 3 - \tan^{3} (x)}{1 - 3 \tan^{2} (x)})}$

Step 3.3.4.2

Factor $\tan (x)$ out of $- \tan^{3} (x)$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) \cdot 3 + \tan (x) (- \tan^{2} (x))}{1 - 3 \tan^{2} (x)})}$

Step 3.3.4.3

Factor $\tan (x)$ out of $\tan (x) \cdot 3 + \tan (x) (- \tan^{2} (x))$ .

$\frac{2 \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)})}$

Step 4

Combine $2$ and $\frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}$ .

$\frac{\frac{2 (\tan (x) (3 - \tan^{2} (x)))}{1 - 3 \tan^{2} (x)}}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)})}$

Step 5

Multiply the numerator by the reciprocal of the denominator.

$\frac{2 \tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)} \cdot \frac{1}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)})}$

Step 6

Multiply $\frac{2 \tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}$ by $\frac{1}{(1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)})}$ .

$\frac{2 \tan (x) (3 - \tan^{2} (x))}{(1 - 3 \tan^{2} (x)) (1 + \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)}) (1 - \frac{\tan (x) (3 - \tan^{2} (x))}{1 - 3 \tan^{2} (x)})}$