Trigonometry Examples

$(\cot (x) - 1) (\sqrt{3} \cot (x) + 1) = 0$

Step 1

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$\cot (x) - 1 = 0$

$\sqrt{3} \cot (x) + 1 = 0$

Step 2

Set $\cot (x) - 1$ equal to $0$ and solve for $x$ .

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Step 2.1

Set $\cot (x) - 1$ equal to $0$ .

$\cot (x) - 1 = 0$

Step 2.2

Solve $\cot (x) - 1 = 0$ for $x$ .

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Step 2.2.1

Add $1$ to both sides of the equation.

$\cot (x) = 1$

Step 2.2.2

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

$x = arccot (1)$

Step 2.2.3

Simplify the right side.

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Step 2.2.3.1

The exact value of $arccot (1)$ is $\frac{π}{4}$ .

$x = \frac{π}{4}$

Step 2.2.4

The cotangent 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.

$x = π + \frac{π}{4}$

Step 2.2.5

Simplify $π + \frac{π}{4}$ .

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Step 2.2.5.1

To write $π$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$x = π \cdot \frac{4}{4} + \frac{π}{4}$

Step 2.2.5.2

Combine fractions.

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Step 2.2.5.2.1

Combine $π$ and $\frac{4}{4}$ .

$x = \frac{π \cdot 4}{4} + \frac{π}{4}$

Step 2.2.5.2.2

Combine the numerators over the common denominator.

$x = \frac{π \cdot 4 + π}{4}$

Step 2.2.5.3

Simplify the numerator.

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Step 2.2.5.3.1

Move $4$ to the left of $π$ .

$x = \frac{4 \cdot π + π}{4}$

Step 2.2.5.3.2

Add $4 π$ and $π$ .

$x = \frac{5 π}{4}$

Step 2.2.6

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

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Step 2.2.6.1

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

$\frac{π}{| b |}$

Step 2.2.6.2

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

$\frac{π}{| 1 |}$

Step 2.2.6.3

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

$\frac{π}{1}$

Step 2.2.6.4

Divide $π$ by $1$ .

$π$

Step 2.2.7

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

$x = \frac{π}{4} + π n, \frac{5 π}{4} + π n$ , for any integer $n$

Step 3

Set $\sqrt{3} \cot (x) + 1$ equal to $0$ and solve for $x$ .

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Step 3.1

Set $\sqrt{3} \cot (x) + 1$ equal to $0$ .

$\sqrt{3} \cot (x) + 1 = 0$

Step 3.2

Solve $\sqrt{3} \cot (x) + 1 = 0$ for $x$ .

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Step 3.2.1

Subtract $1$ from both sides of the equation.

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

Step 3.2.2

Divide each term in $\sqrt{3} \cot (x) = - 1$ by $\sqrt{3}$ and simplify.

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Step 3.2.2.1

Divide each term in $\sqrt{3} \cot (x) = - 1$ by $\sqrt{3}$ .

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

Step 3.2.2.2

Simplify the left side.

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Step 3.2.2.2.1

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

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Step 3.2.2.2.1.1

Cancel the common factor.

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

Step 3.2.2.2.1.2

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

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

Step 3.2.2.3

Simplify the right side.

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Step 3.2.2.3.1

Move the negative in front of the fraction.

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

Step 3.2.2.3.2

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

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

Step 3.2.2.3.3

Combine and simplify the denominator.

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Step 3.2.2.3.3.1

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

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

Step 3.2.2.3.3.2

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

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

Step 3.2.2.3.3.3

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

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

Step 3.2.2.3.3.4

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

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

Step 3.2.2.3.3.5

Add $1$ and $1$ .

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

Step 3.2.2.3.3.6

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

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Step 3.2.2.3.3.6.1

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 3.2.2.3.3.6.2

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 3.2.2.3.3.6.3

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

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

Step 3.2.2.3.3.6.4

Cancel the common factor of $2$ .

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Step 3.2.2.3.3.6.4.1

Cancel the common factor.

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

Step 3.2.2.3.3.6.4.2

Rewrite the expression.

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

Step 3.2.2.3.3.6.5

Evaluate the exponent.

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

Step 3.2.3

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

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

Step 3.2.4

Simplify the right side.

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Step 3.2.4.1

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

$x = \frac{2 π}{3}$

Step 3.2.5

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 3.2.6

Simplify the expression to find the second solution.

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Step 3.2.6.1

Add $2 π$ to $\frac{2 π}{3} - π$ .

$x = \frac{2 π}{3} - π + 2 π$

Step 3.2.6.2

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

$x = \frac{5 π}{3}$

Step 3.2.7

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

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Step 3.2.7.1

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

$\frac{π}{| b |}$

Step 3.2.7.2

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

$\frac{π}{| 1 |}$

Step 3.2.7.3

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

$\frac{π}{1}$

Step 3.2.7.4

Divide $π$ by $1$ .

$π$

Step 3.2.8

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 4

The final solution is all the values that make $(\cot (x) - 1) (\sqrt{3} \cot (x) + 1) = 0$ true.

$x = \frac{π}{4} + π n, \frac{5 π}{4} + π n, \frac{2 π}{3} + π n, \frac{5 π}{3} + π n$ , for any integer $n$

Step 5

Consolidate the answers.

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Step 5.1

Consolidate $\frac{π}{4} + π n$ and $\frac{5 π}{4} + π n$ to $\frac{π}{4} + π n$ .

$x = \frac{π}{4} + π n, \frac{2 π}{3} + π n, \frac{5 π}{3} + π n$ , for any integer $n$

Step 5.2

Consolidate $\frac{2 π}{3} + π n$ and $\frac{5 π}{3} + π n$ to $\frac{2 π}{3} + π n$ .

$x = \frac{π}{4} + π n, \frac{2 π}{3} + π n$ , for any integer $n$