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Prove that (cos x + cos y)2 + (sin x – sin y)2 = 4 cos2 ( x + y)/2

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asked Dec 25, 2016 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 947

Prove that (cos x + cos y)2 + (sin x – sin y)2 = 4 cos2 ( x + y)/2

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answered Dec 25, 2016 by vikash (21,277 points) ● 4 ● 19 ● 70
 
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Proof for the question:

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