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


Use your knowledge of the unit circle to explain why the graphs of and are the same.

 is equivalent to

Sketch a unit circle. Choose any angle. Find the sine and cosine of the angle. Now subtract 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.