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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 "],[[" a."(1)/((1+x)^(2))," b."-(1)/((1+x)^(2))],[" c."(1)/((1+x^(2)))," d."(1)/((1+x))]]

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