### Home > CCA2 > Chapter 8 > Lesson 8.1.1 > Problem 8-16

8-16.

Without a calculator, find two solutions

Draw a unit circle.

The cosine is where the

value (red line) is Answers: 60° and 300°

Draw and label a unit circle as in part (a). Don't forget that the sine is the

*y*-value! Which quadrants will the angles be in?

See part (c).