Trigonometry Examples

$\tan (x) = \tan (\frac{π}{5})$

Step 1

For the two functions to be equal, the arguments of each must be equal.

$x = \frac{π}{5}$

Step 2

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.

$x = π + \frac{π}{5}$

Step 3

Simplify $π + \frac{π}{5}$ .

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Step 3.1

To write $π$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$x = π \cdot \frac{5}{5} + \frac{π}{5}$

Step 3.2

Combine fractions.

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Step 3.2.1

Combine $π$ and $\frac{5}{5}$ .

$x = \frac{π \cdot 5}{5} + \frac{π}{5}$

Step 3.2.2

Combine the numerators over the common denominator.

$x = \frac{π \cdot 5 + π}{5}$

Step 3.3

Simplify the numerator.

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Step 3.3.1

Move $5$ to the left of $π$ .

$x = \frac{5 \cdot π + π}{5}$

Step 3.3.2

Add $5 π$ and $π$ .

$x = \frac{6 π}{5}$

Step 4

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

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Step 4.1

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

$\frac{π}{| b |}$

Step 4.2

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

$\frac{π}{| 1 |}$

Step 4.3

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

$\frac{π}{1}$

Step 4.4

Divide $π$ by $1$ .

$π$

Step 5

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

$x = \frac{π}{5} + π n, \frac{6 π}{5} + π n$ , for any integer $n$

Step 6

Consolidate the answers.

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