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.
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.