##r^2=x^2+y^2\;\Rightarrow \; 2r\frac{dr}{dx}=2x\;\Rightarrow\; \frac{dr}{dx}=\frac{x}{r}##(adsbygoogle = window.adsbygoogle || []).push({});

Then is it true ##\frac{dx}{dr}=\frac{r}{x}##?

I am not sure this is correct as

[tex]r^2=x^2+y^2\;\Rightarrow \; 2r=2x\frac{dx}{dr}+2y\frac{dy}{dr}[/tex]

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# Question on differentiation.

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