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Cos (36^ - A ) (36^ + A )+ (54^ + A ) (54^ - A )=

Options

  1. ACos 2 ~A
  2. BCos A
  3. CSin 2 ~A
  4. DSin A

Correct answer

A. Cos 2 ~A

Step-by-step solution

(D) array l (36^ - A ) (36^ + A )+ (54^ + A ) (54^ - A ) = (36^ - A ) (36^ + A )+ [90^ - (36^ - A ) ] [90^ - (36^ + A ) ] array = (36^ - A ) (36^ + A )+ (36^ - A ) (36^ + A )= [ (36^ - A )- (36^ + A ) ]= [36^ - A -36^ - A ]= (-2 ~A )= 2 ~A

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