# Unit Circle & Inverse Trig Functions

Lead Author(s): **Kelly Cline**

Student Price: **FREE**

These questions make use of the unit circle to judge properties of angles and to evaluate inverse trigonometric functions at special angles.

What is arcsin $\left( \frac{1}{2} \right)$?

0

$\frac{\pi}{6}$

$\frac{\pi}{4}$

$\frac{\pi}{3}$

Which of the following is the approximate value for the sine and cosine of angles $A$ and $B$ in the figure below.

sin $A \approx$ 0.5, cos $A \approx$ 0.85, sin $B \approx$ –0.7, cos $B \approx$ 0.7

sin $A \approx$ 0.85, cos $A \approx$ 0.5, sin $B \approx$ –0.7, cos $B \approx$ 0.7

sin $A \approx$ 0.5, cos $A \approx$ 0.85, sin $B \approx$ 0.7, cos $B \approx$ 0.7

sin $A \approx$ 0.85, cos $A \approx$ 0.5, sin $B \approx$ 0.7, cos $B \approx$ 0.7