Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos (27°) - sin (27°) = cos(A°), then A = degrees. %3D (b) If cos (9z) – sin (9x) = cos(B), then %3D B = %3D

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A: I = E/Z E = 8(cos20° + i sin20°) Z = R + XLi = 6 + 3i

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A: Please refer the attached image for complete solution.

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A: As it is specially mentioned to tell the specific part of the problem ,so it is explained below.

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Q: Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos (27°) – sin…

A: cos^2 x - sin^2 x = cos 2x

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Q: Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos (26°) – sin…

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A: cos2A-sin2A=cos 2A