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Assuming that $u = f(x,y)$, $x = e^s\sin(t)$, $y = e^s\sin(t)$

Show that $(\frac{\partial u}{\partial s})^2 \neq \frac{\partial^2 u}{\partial d s^2}$

I know what to do, but I don't know how to do it. The RHS gives me difficulties.

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    Were $x$ and $y$ intended to be the same? Is $\sin$ a part of the exponent? How is this discrete?2012-11-14
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    doesn't discrete math involve proofs?2012-11-14
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    All math involves proofs. Discrete is the opposite of continuous. Discrete math involves things like number theory, graphs, etc.2012-11-14
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    Are you sure is $\frac{\partial^2 u}{\partial ds^s}$ is well written? It doesn't have meaning at all. Also, related: http://math.stackexchange.com/q/235103/195322012-11-14

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