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Prove that (cos x- cos y ) ^2 + ( si...

Prove that ` (cos x- cos y ) ^2 + ( sin x - sin y ) ^2 = 4 sin ^2"" ((x-y))/(2)`

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`= 4 sin ^2 ((x-y))/(2)`
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NEW JOYTHI PUBLICATION-TRIGONOMETRIC FUNCTIONS-QUESTIONS FROM COMPETITIVE EXAMS
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