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If sqrt(y+x)+sqrt(y-x)=c ,show that ...

If `sqrt(y+x)+sqrt(y-x)=c` ,show that `(dy)/(dx)=y/x-sqrt((y^2)/(x^2)-1.)`

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sqrt(x+y)+sqrt(y-x)=c , then (d^2y)/(dx^2) equals

1. x(dy)/(dx)-y=x sqrt(x^(2)+y^(2))