Question: If z = f(x, y) has continuous second-order partial derivatives and x = r 2 + s 2 and y = 2rs, find (a) z/r

If z = f(x, y) has continuous second-order partial derivatives and x = r2 + s2 and y = 2rs, find 

(a) ∂z/∂r 

(b) ∂2z/∂r2.

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