Question: Find x/u and y/u if the equations u = x 2 - y 2 and y = x 2 - y define x and y

Find ∂x/∂u and ∂y/∂u if the equations u = x² - y² and y = x² - y define x and y as functions of the independent variables u and y, and the partial derivatives exist. Then let s = x² + y² and find ∂s/∂u.

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