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[" If "sin x=(2t)/(1+t^(2))" and "cot y=...

[" If "sin x=(2t)/(1+t^(2))" and "cot y=(1-t^(2))/(2t)" .Then value "],[" of "(d^(2)x)/(dy^(2))" is cqual to "],[[" (A) "0," (B) "1],[" (C) "-1," (D) "(1)/(2)]]

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