Question: Assume that all the given functions are differentiable. If z = f (x, y), where x = r cos and y = r sin

Assume that all the given functions are differentiable.

If z = f (x, y), where x = r cos θ and y = r sin θ,

(a) find ∂z/∂r and ∂z/∂θ and 

(b) show thatе-Ө'-Ө-не r? дх ду ar

-'-- r? ar

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