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Home > CCA2 > Chapter 12 > Lesson 12.2.3 > Problem 12-130


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.
Refer to the Math Notes in Lesson 12.2.3.

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.