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[" 31.2यदि "sin^(-1)x+2cot^(-1)(y^(2)-2y...

[" 31.2यदि "sin^(-1)x+2cot^(-1)(y^(2)-2y)=2 pi" है,तो "],[[" (A) "x+y=y^(2)," (В) "x^(2)=x+y," (C) "y=y^(2)," (D) "x^(2)-x+y=y^(2)]]

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