I have some important questions and essentials for understand some theories. They are six:(adsbygoogle = window.adsbygoogle || []).push({});

given f(r(t)), f(r(u, v)), f(r(u(t), v(t))),f(r(t)),f(r(u, v)) andf(r(u(t), v(t))). How compute its derivatives wrt independent variables?

Unfortunately, Ijustknow the answer for 1nd:

[tex]\frac{df}{dt}=\frac{df}{d\vec{r}}\cdot \frac{d\vec{r}}{dt}[/tex]

I don't know equate the other derivatives.

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# Some differentiations

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