### Home > PC > Chapter 4 > Lesson 4.2.1 > Problem 4-71

4-71.

Find all values of

*θ*from [0, 2] where the following equations are true. Sketching a picture of the unit circle may help. Homework Help ✎sin

*θ*=cos

*θ*= −sin

*θ*=cos

*θ*= 0

What special angle(s) are involved?

What does the negative sign mean?

These angles are coterminal with the *y*-axis.