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Mathematics, 12.04.2021 23:40 drainy0uandthefish

Which of the following are identities? Check all that apply. A. sin(x + y) + sin(x - y) = 2cosx siny
B. cos(x + y) - cos(x- y) = 2 cos xcosy
C. tan(x - 7T) = tan x
O D. cos(x + y) + cos(x - y) = 2cos x cosy

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Which of the following are identities? Check all that apply. A. sin(x + y) + sin(x - y) = 2cosx sin...

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