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[" 13."x sqrt(1+y)+y sqrt(1+x)=0" zort "...

[" 13."x sqrt(1+y)+y sqrt(1+x)=0" zort "ax>11" s "Q^(2)],[" (i) "(dy)/(dx)=-(1)/((1+x)^(2))[NCERT]" (ii) "(d^(2)y)/(dx^(2))=(2)/((1+x)^(3))]

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