Which of the following are identities? Check all that apply.
A. sin(x + y) - sin(x - y) = 2 co...
Mathematics, 07.05.2020 01:16 tiffanyrenee3355
Which of the following are identities? Check all that apply.
A. sin(x + y) - sin(x - y) = 2 cosx siny
B. cos(x + y) + cos(x - y) = cos? x- sin? y
C. cos(x+y)+cos(x - y) = 2cos x cosy
D. sin(x - 1) = - sinx
Answers: 1
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