Assume that all the given functions have continuous second-order partial derivatives. If z = f(x, y), where x = r2 + s2 and y = 4rs, find ∂2z/(∂r ∂s). (Compare with this example.) ∂2z ∂r ∂s = ∂2z ∂x2 + ∂2z ∂y2 + ∂2z ∂x ∂y + ∂z ∂y

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