Trigonometry Examples

$- 390 °$

Step 1

Add $360 °$ to $- 390 °$ .

$- 390 ° + 360 °$

Step 2

The resulting angle of $- 30 °$ is coterminal with $- 390 °$ but isn't positive. Repeat the step.

$- 30 °$

Step 3

Add $360 °$ to $- 30 °$ .

$- 30 ° + 360 °$

Step 4

The resulting angle of $330 °$ is positive and coterminal with $- 390 °$ .

$330 °$