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#### OhMyMarkov

##### Member

- Mar 5, 2012

- 83

Hello everyone, I remember this from single-variable calculus: if f(x) = 2x, then df = 2dx, right?

What if $f(r, \theta) = r\cos \theta$, how can I express $\partial f$ in terms of $r$ and $\theta$.?

Thanks!

What if $f(r, \theta) = r\cos \theta$, how can I express $\partial f$ in terms of $r$ and $\theta$.?

Thanks!

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