if u=f(r) where r^2=x^2+y^2, show that d^2u/dx^2 +d^2u/dy^2 = f'(r)+1/r f'(r).

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if u=f(r) where r^2=x^2+y^2, show that d^2u/dx^2 +d^2u/dy^2 = f"(r)+1/r f'(r).
partial derivatives.
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Thank you so so so much sir/ma'am this was such an easy way to solve it!! This is a very imp ques since it had been coming since 2006 so I'm very thankful ❤

dekiverse
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cant we do it with the method by putting u=r=(x^2+y^2)^1/2

tulikachhaukhhadiya
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