Use one or more of the six sum and difference identities to solve Exercises 13–54. In Exercises 25–32, write each expression as the sine, cosine, or tangent of an angle. Then find the exact value of the expression. 5𝝅 𝝅 5𝝅 𝝅 sin ------- cos -------- ﹣ cos -------- sin ------- 12 4 12 4