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Prove that (cos x - cos y)2 + (sin x – sin y)2 = 4 sin2 ( x - y)/2

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asked Dec 25, 2016 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 946

Prove that (cos x - cos y)2 + (sin x – sin y)2 = 4 sin2 ( x - y)/2

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answered Dec 25, 2016 by sarthaks (25,122 points) ● 9 ● 24 ● 36
 
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Proof of the question is given below:

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