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

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

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