Question

2cos(45+a).cos(45-a)

Answer 1

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Answer 2

$2\cos(45 + a) \cos(45 -a) \\ \cos(45 + a + 45 - a) + \cos(45 + a - 45 + a) \\ \cos(90) + \cos(2a) \\ 0 + \cos(2a) \\ \cos(2a)$