Trigonometry Examples

$4 \cos (x) = 4 \sqrt{3} \sin (x)$

Step 1

Divide each term in the equation by $\cos (x)$ .

$\frac{4 \cos (x)}{\cos (x)} = \frac{4 \sqrt{3} \sin (x)}{\cos (x)}$

Step 2

Cancel the common factor of $\cos (x)$ .

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Step 2.1

Cancel the common factor.

$\frac{4 \cos (x)}{\cos (x)} = \frac{4 \sqrt{3} \sin (x)}{\cos (x)}$

Step 2.2

Divide $4$ by $1$ .

$4 = \frac{4 \sqrt{3} \sin (x)}{\cos (x)}$

Step 3

Separate fractions.

$4 = \frac{4 \sqrt{3}}{1} \cdot \frac{\sin (x)}{\cos (x)}$

Step 4

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

$4 = \frac{4 \sqrt{3}}{1} \cdot \tan (x)$

Step 5

Divide $4 \sqrt{3}$ by $1$ .

$4 = 4 \sqrt{3} \tan (x)$

Step 6

Rewrite the equation as $4 \sqrt{3} \tan (x) = 4$ .

$4 \sqrt{3} \tan (x) = 4$

Step 7

Divide each term in $4 \sqrt{3} \tan (x) = 4$ by $4 \sqrt{3}$ and simplify.

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Step 7.1

Divide each term in $4 \sqrt{3} \tan (x) = 4$ by $4 \sqrt{3}$ .

$\frac{4 \sqrt{3} \tan (x)}{4 \sqrt{3}} = \frac{4}{4 \sqrt{3}}$

Step 7.2

Simplify the left side.

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Step 7.2.1

Cancel the common factor of $4$ .

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Step 7.2.1.1

Cancel the common factor.

$\frac{4 \sqrt{3} \tan (x)}{4 \sqrt{3}} = \frac{4}{4 \sqrt{3}}$

Step 7.2.1.2

Rewrite the expression.

$\frac{\sqrt{3} \tan (x)}{\sqrt{3}} = \frac{4}{4 \sqrt{3}}$

Step 7.2.2

Cancel the common factor of $\sqrt{3}$ .

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Step 7.2.2.1

Cancel the common factor.

$\frac{\sqrt{3} \tan (x)}{\sqrt{3}} = \frac{4}{4 \sqrt{3}}$

Step 7.2.2.2

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

$\tan (x) = \frac{4}{4 \sqrt{3}}$

Step 7.3

Simplify the right side.

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Step 7.3.1

Cancel the common factor of $4$ .

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Step 7.3.1.1

Cancel the common factor.

$\tan (x) = \frac{4}{4 \sqrt{3}}$

Step 7.3.1.2

Rewrite the expression.

$\tan (x) = \frac{1}{\sqrt{3}}$

Step 7.3.2

Multiply $\frac{1}{\sqrt{3}}$ by $\frac{\sqrt{3}}{\sqrt{3}}$ .

$\tan (x) = \frac{1}{\sqrt{3}} \cdot \frac{\sqrt{3}}{\sqrt{3}}$

Step 7.3.3

Combine and simplify the denominator.

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Step 7.3.3.1

Multiply $\frac{1}{\sqrt{3}}$ by $\frac{\sqrt{3}}{\sqrt{3}}$ .

$\tan (x) = \frac{\sqrt{3}}{\sqrt{3} \sqrt{3}}$

Step 7.3.3.2

Raise $\sqrt{3}$ to the power of $1$ .

$\tan (x) = \frac{\sqrt{3}}{{\sqrt{3}}^{1} \sqrt{3}}$

Step 7.3.3.3

Raise $\sqrt{3}$ to the power of $1$ .

$\tan (x) = \frac{\sqrt{3}}{{\sqrt{3}}^{1} {\sqrt{3}}^{1}}$

Step 7.3.3.4

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

$\tan (x) = \frac{\sqrt{3}}{{\sqrt{3}}^{1 + 1}}$

Step 7.3.3.5

Add $1$ and $1$ .

$\tan (x) = \frac{\sqrt{3}}{{\sqrt{3}}^{2}}$

Step 7.3.3.6

Rewrite ${\sqrt{3}}^{2}$ as $3$ .

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Step 7.3.3.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{3}$ as $3^{\frac{1}{2}}$ .

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

Step 7.3.3.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

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

Step 7.3.3.6.3

Combine $\frac{1}{2}$ and $2$ .

$\tan (x) = \frac{\sqrt{3}}{3^{\frac{2}{2}}}$

Step 7.3.3.6.4

Cancel the common factor of $2$ .

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Step 7.3.3.6.4.1

Cancel the common factor.

$\tan (x) = \frac{\sqrt{3}}{3^{\frac{2}{2}}}$

Step 7.3.3.6.4.2

Rewrite the expression.

$\tan (x) = \frac{\sqrt{3}}{3^{1}}$

Step 7.3.3.6.5

Evaluate the exponent.

$\tan (x) = \frac{\sqrt{3}}{3}$

Step 8

Take the inverse tangent of both sides of the equation to extract $x$ from inside the tangent.

$x = \arctan (\frac{\sqrt{3}}{3})$

Step 9

Simplify the right side.

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Step 9.1

The exact value of $\arctan (\frac{\sqrt{3}}{3})$ is $\frac{π}{6}$ .

$x = \frac{π}{6}$

Step 10

The tangent function is positive in the first and third quadrants. To find the second solution, add the reference angle from $π$ to find the solution in the fourth quadrant.

$x = π + \frac{π}{6}$

Step 11

Simplify $π + \frac{π}{6}$ .

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Step 11.1

To write $π$ as a fraction with a common denominator, multiply by $\frac{6}{6}$ .

$x = π \cdot \frac{6}{6} + \frac{π}{6}$

Step 11.2

Combine fractions.

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Step 11.2.1

Combine $π$ and $\frac{6}{6}$ .

$x = \frac{π \cdot 6}{6} + \frac{π}{6}$

Step 11.2.2

Combine the numerators over the common denominator.

$x = \frac{π \cdot 6 + π}{6}$

Step 11.3

Simplify the numerator.

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Step 11.3.1

Move $6$ to the left of $π$ .

$x = \frac{6 \cdot π + π}{6}$

Step 11.3.2

Add $6 π$ and $π$ .

$x = \frac{7 π}{6}$

Step 12

Find the period of $\tan (x)$ .

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Step 12.1

The period of the function can be calculated using $\frac{π}{| b |}$ .

$\frac{π}{| b |}$

Step 12.2

Replace $b$ with $1$ in the formula for period.

$\frac{π}{| 1 |}$

Step 12.3

The absolute value is the distance between a number and zero. The distance between $0$ and $1$ is $1$ .

$\frac{π}{1}$

Step 12.4

Divide $π$ by $1$ .

$π$

Step 13

The period of the $\tan (x)$ function is $π$ so values will repeat every $π$ radians in both directions.

$x = \frac{π}{6} + π n, \frac{7 π}{6} + π n$ , for any integer $n$

Step 14

Consolidate the answers.

$x = \frac{π}{6} + π n$ , for any integer $n$