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

Prove that (cos x-cos y)^2 + (sin x-sin y)^2 = 4sin^2 (x-y)/2 | Trigonometry Class 11 Miscellaneous

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Prove that (cos x-cos y)^2 + (sin x-sin y)^2 = 4sin^2 (x-y)/2 | Trigonometry Class 11 Miscellaneous