### Home > CCA2 > Chapter 12 > Lesson 12.2.3 > Problem 12-131

12-131.

Write each angle as the sum or difference of two special angles and then find the exact sine or cosine. Homework Help ✎

sin

Refer to problem 12-130. Find a way to add or subtract two familiar angles from the unit circle to get the desired angle. Then use the appropriate identity from the Math Notes in Lesson 12.2.3.

cos

Use the same method as part (a).