Question: Assume that all the given functions have continuous second-order partial derivatives. If z = f (x, y), where x = r 2 + s 2

Assume that all the given functions have continuous second-order partial derivatives.
If z = f (x, y), where x = r² + s² and y = 2rs, find ∂2z/∂r ∂s. (Compare with Example 7.)

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