Question: 27. Reduce the following expression to a single function of one angle: cos(45 +A) + cos(45 - A). A. 2inA B. 2sin A C.

27. Reduce the following expression to a single function of one angle:

27. Reduce the following expression to a single function of one angle: cos(45 +A) + cos(45 - A). A. 2inA B. 2sin A C. 2COSA D. -2COSA

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