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Suppose that for some angles x and y the...

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

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