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Question Number 7938 by tawakalitu last updated on 24/Sep/16

if f(x) = xlog(x + r) − r and r^2 = x^2 + y^2 prove that: f_(xx) + f_(yy) = (1/(x + r))

iff(x)=xlog(x+r)−randr2=x2+y2provethat:fxx+fyy=1x+r

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