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

[" If "x sqrt(1+y)+y sqrt(1+x)=0" and "x!=y" then "(dy)/(dx)=],[[" 1) "(x+1)/((1-x)^(2))," 2) "(1)/((1-x)^(2))," 3) "(-1)/((1+x)^(2))," 4) "(-1)/((1-x)^(2))]]

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