Question: Assume that all the given functions have continuous second-order partial derivatives. If u = f (x, y), where x = e s cos t and

Assume that all the given functions have continuous second-order partial derivatives.
If u = f (x, y), where x = e^s cos t and y = e^s sin t, show that д'и д'и ди а?и дs2 дг 2s дх? ду?

' ' ? s2 2s ? ?

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