### Home > CCA2 > Chapter 8 > Lesson 8.3.2 > Problem 8-162

8-162.

Use your knowledge of the unit circle to explain why the graphs of *y* = sin*θ *and *y* = cos(*θ *−* *

Sketch a unit circle. Choose any angle. Find the sine and cosine of the angle. Now subtract 90^{°} from your angle and find the sine and cosine again. What happened? If you draw an accurate reference triangle, it will help you see what is going on here.