Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.5 The Chain Rule, #44 · Multivariable Calculus · Partial derivatives

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Suppose $x = t + u$ and $y = t u$ . Find the $t$ and $u$ derivatives of $f (x, y)$ . Check when $f (x, y) = x^{2} - 2 y$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.5 The Chain Rule, #44

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