Prove that ( cosx- cosy)^2 + (sinx- siny)^2 = 4 sin^2 [( x-y)/2]

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prove that ( cosx- cosy)^2 + (sinx- siny)^2 = 4 sin^2 [( x-y)/2]

Shahul Hameed Banglavil

Feb. 24, 2018, 11:55 p.m.

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