Problem

a. Apply the formula for cos (A – B) to the identity sin θ = to obtain the addition for...

a. Apply the formula for cos (A – B) to the identity sin θ = to obtain the addition formula for sin (A + B).

b. Derive the formula for cos (A + B) by substituting –B for B in the formula for cos (A – B) from Exercise 35.

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Solutions For Problems in Chapter 1.3

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