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Find all the solution of x,y in the equa...

Find all the solution of x,y in the equation
`4(3sqrt(4x-x^(2))sin^(2)""((x+y)/(2))+2cos(x+y))=13+4 cos^(2)(x+y)`

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The correct Answer is:
`(2, 2n pi pm (2pi)/3-2)`
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