Trigonometry Examples

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

Step 1

Simplify $- \frac{1}{\sqrt{3}}$ .

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Step 1.1

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

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

Step 1.2

Combine and simplify the denominator.

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Step 1.2.1

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

$\cot (x) = - \frac{\sqrt{3}}{\sqrt{3} \sqrt{3}}$

Step 1.2.2

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

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

Step 1.2.3

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

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

Step 1.2.4

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

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

Step 1.2.5

Add $1$ and $1$ .

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

Step 1.2.6

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

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Step 1.2.6.1

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

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

Step 1.2.6.2

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

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

Step 1.2.6.3

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

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

Step 1.2.6.4

Cancel the common factor of $2$ .

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Step 1.2.6.4.1

Cancel the common factor.

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

Step 1.2.6.4.2

Rewrite the expression.

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

Step 1.2.6.5

Evaluate the exponent.

$\cot (x) = - \frac{\sqrt{3}}{3}$

Step 2

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

$x = arccot (- \frac{\sqrt{3}}{3})$

Step 3

Simplify the right side.

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Step 3.1

The exact value of $arccot (- \frac{\sqrt{3}}{3})$ is $\frac{2 π}{3}$ .

$x = \frac{2 π}{3}$

Step 4

The cotangent function is negative in the second and fourth quadrants. To find the second solution, subtract the reference angle from $π$ to find the solution in the third quadrant.

$x = \frac{2 π}{3} - π$

Step 5

Simplify the expression to find the second solution.

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Step 5.1

Add $2 π$ to $\frac{2 π}{3} - π$ .

$x = \frac{2 π}{3} - π + 2 π$

Step 5.2

The resulting angle of $\frac{5 π}{3}$ is positive and coterminal with $\frac{2 π}{3} - π$ .

$x = \frac{5 π}{3}$

Step 6

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

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Step 6.1

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

$\frac{π}{| b |}$

Step 6.2

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

$\frac{π}{| 1 |}$

Step 6.3

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

$\frac{π}{1}$

Step 6.4

Divide $π$ by $1$ .

$π$

Step 7

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

$x = \frac{2 π}{3} + π n, \frac{5 π}{3} + π n$ , for any integer $n$

Step 8

Consolidate the answers.

$x = \frac{2 π}{3} + π n$ , for any integer $n$