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Mathematics, 24.07.2020 22:01 hickslily9
Which of the following are identities? Check all that apply.
A. cos(x + y) + cos(x - y) = 2cos x cosy
B. sin(x + y) - sin(x-y) = 2cosx siny
C. cos(x + y) + cos(x - y) = cos x -
- sin? y
D. sin(x - 7T) = - sinx
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Which of the following are identities? Check all that apply.
A. cos(x + y) + cos(x - y) = 2cos x co...
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