Question: Suppose that for some angles x and y the equations sin'r + cosy = , cos?r + sin'y = simultaneously then the value of

Suppose that for some angles x and y the equations sin'r +

Suppose that for some angles x and y the equations sin'r + cos"y = , cos?r + sin'y = simultaneously then the value of cos2x - cos2y equals (A) a (B) 2-a (C) 3a - 2 (D) 2a - 3

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