Trigonometry Examples

$\cot (θ) - 1 = 0$

Step 1

Add $1$ to both sides of the equation.

$\cot (θ) = 1$

Step 2

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

$θ = arccot (1)$

Step 3

Simplify the right side.

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Step 3.1

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

$θ = \frac{π}{4}$

Step 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.

$θ = π + \frac{π}{4}$

Step 5

Simplify $π + \frac{π}{4}$ .

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Step 5.1

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

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

Step 5.2

Combine fractions.

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Step 5.2.1

Combine $π$ and $\frac{4}{4}$ .

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

Step 5.2.2

Combine the numerators over the common denominator.

$θ = \frac{π \cdot 4 + π}{4}$

Step 5.3

Simplify the numerator.

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Step 5.3.1

Move $4$ to the left of $π$ .

$θ = \frac{4 \cdot π + π}{4}$

Step 5.3.2

Add $4 π$ and $π$ .

$θ = \frac{5 π}{4}$

Step 6

Find the period of $\cot (θ)$ .

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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 $\cot (θ)$ function is $π$ so values will repeat every $π$ radians in both directions.

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

Step 8

Consolidate the answers.

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