Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos²(32°) – sin²(32°) = cos(A°), then - A = degrees (b) If cos² (3x) — sin²(3x) = cos(B), then B =

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A: As per our guidelines we can answer only one question so kindly repost the remaining questions…

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A: The following problem refers to triangle .If , and , then to find  and then to find .

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A: Identity used

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A: Note : As per our guidelines, we can solve first question. Please repost remaining questions.

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