Question: Suppose that for some angles x and y the equations sinr + cosy = , cosz + sin'y = = simultaneously then the value

Suppose that for some angles x and y the equations sinr +

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

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