CPM Homework Banner

Home > A2C > Chapter 13 > Lesson 13.2.3 > Problem 13-129

13-129.

Write as the difference of two special angles. Then use the appropriate angle difference formula to find the exact sine and cosine of . Homework Help ✎

 you can use the Angle Difference Identity.

Substitute the angles into the Angle Difference Identity.

Substitute the exact values for each part of the equation.
Then simplify the multiplication and subtraction.

Repeat this process for cosine.