Mathematics, 28.08.2019 09:30, VelvetXace

Prove the identity: (cosx + cosy)^2 + (sinx - siny)^2 = 2 + 2 cos (x+y).

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Prove the identity: (cosx + cosy)^2 + (sinx - siny)^2 = 2 + 2 cos (x+y)....