Trigonometry Examples

$\tan (9 π)$

Step 1

Subtract full rotations of $2 π$ until the angle is greater than or equal to $0$ and less than $2 π$ .

$\tan (π)$

Step 2

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because tangent is negative in the second quadrant.

$- \tan (0)$

Step 3

The exact value of $\tan (0)$ is $0$ .

$- 0$

Step 4

Multiply $- 1$ by $0$ .

$0$