Exercise 1 Page 915

We want to find all angles whose sine is

- \frac{1}{2} .

Since we know the value of sine but not the measure of the angle, the process of finding the missing value uses an inverse trigonometric function.

sin^{- 1} (- \frac{1}{2})

First, we need to draw the angle in standard position on a unit circle. The sine of an angle in standard position is the

y -

coordinate of the point of intersection of its terminal side and the unit circle. On the same coordinate plane, we will use those points to draw two right triangles, each with one leg on the

x -

axis.