MediumPartial derivatives

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.1 Surfaces and Level Curves, #16 · Multivariable Calculus · Partial derivatives

Find a function … whose level curve … consists of a circle…

Find a function $f (x, y)$ whose level curve $f = 0$ consists of a circle and _all points inside it_.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.1 Surfaces and Level Curves, #16

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