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[" If "x sqrt(1+y)+y sqrt(1+x)=0" ,then ...

[" If "x sqrt(1+y)+y sqrt(1+x)=0" ,then "(dy)/(dx)" is equal to "],[[" (A) "(1)/((1+x)^(2))," (B) "-(1)/((1+x)^(2))," (C) "(1)/((1+x^(2)))," (D) "-(1)/((1+x^(2)))]]

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