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## Homework Statement

express [tex](\frac{\partial u}{\partial s})_{v}[/tex] in terms of partial derivatives of u(s,t) and t(s,v)

## Homework Equations

## The Attempt at a Solution

I'm pretty stuck with this problem. I know that

dv = [tex](\frac{\partial v}{\partial s})_{t} ds + (\frac{\partial v}{\partial t})_{s} dt[/tex]

and similarly for u(s,t) and t(s,v). But problem is that where do I get [tex](\frac{\partial u}{\partial s})_{v}[/tex] from, and how to express it?