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

" 82."[" If "x sqrt(1+y)+y sqrt(1+x)=0,x!=y," then "(ay)/(dx)=],[[" (A) "1+x," (B) "(1+x)^(-2)],[" (D) "-(1+x)^(-1)," (D) "-(1+x)^(-2)]]

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