Question: Decide whether each expression is an identity by substituting values for A and B. a. cos (A + B) = cos A + cos B

Decide whether each expression is an identity by substituting values for A and B.
a. cos (A + B) = cos A + cos B
b. sin (A + B) = sin A + sin B
c. cos (2A) = 2 cos A
d. sin (2A) = 2 sin A

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