Question: Exercise 21 Prove the following multiple angle formulas:7 a. cos(91 + 92) = cos 91 cos 62 sin 91 sin 62 ; b. sin(91 +

Exercise 21 Prove the following multiple angle formulas:7 a. cos(91 +

Exercise 21 Prove the following multiple angle formulas:7 a. cos(91 + 92) = cos 91 cos 62 sin 91 sin 62 ; b. sin(91 + 92) = sin 61 cos 62 + cos 61 sin 6'2

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