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

8-16.

Without a calculator, find two solutions 0° ≤

*θ*< 360° that make each of the following equations true. Homework Help ✎

cos

*θ*=tan

*θ*= −1sin

*θ*= cos

*θ*= −

Draw a unit circle.

Answers: 60° and 300°

135° and 315°

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).