Problem

a. Derive the formula for cos (A + B) by substituting -B for B in the formula for cos (A...

a. Derive the formula for cos (A + B) by substituting -B for B in the formula for cos (A - B) from Exercise 21

b. Apply the formula for cos(A - B) to the identity sin = cos to obtain the addition formula for sin (A + B).

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Solutions For Problems in Chapter A.4