sin(x + y) = sin(x) cos(y) + cos(x) sin(y)cos(x + y) = cos(x) cos(y) − sin(x) sin(y)23a. Find an exact value for sin(75◦).Note: some calculators will do this for you. You must do this using the identities above, and you must show your work.23b. Simplify the following expression: cos(270◦ − θ)

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A: