if-f-x-xlog-x-r-r-and-r-2-x-2-y-2-prove-that-f-xx-f-yy-1-x-r-

Tinku Tara June 3, 2023 Differentiation 0 Comments

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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))

i f f (x) = x l o g (x + r) - r a n d r^{2} = x^{2} + y^{2}

p r o v e t h a t : f_{x x} + f_{y y} = \frac{1}{x + r}

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