a.Apply the formula for cos(A-B) to the identity sin
Chapter 1, Problem 1.3 58(choose chapter or problem)
a.Apply the formula for cos(A-B) to the identity sin u=cosap2-ub to obtain the addition formula for sin(A+B).b.Derive the formula for cos(A+B) by substituting -B for Bin the formula for cos(A-B) from Exercise 35.
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