Question

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Prove that : cos(45° + A) cos(45º - A) = cOS 2 Acos 2A​​

Answer 1

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Clearly sin (45º + A) cos (45º – B) + cos (45º + A) sin (45º – B) = sin (45º + A + 45º – B) = sin (90º + A – B) = cos (A –

Answer 2

Answer:

pls refer to this attachment.

Step-by-step explanation:

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