Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.5 The Chain Rule, #49 · Multivariable Calculus · Partial derivatives

True or false: The directional derivative of … in the direction of…

True or false: The directional derivative of $f (r, θ)$ in the direction of $u_{θ}$ is $\partial f / \partial θ$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.5 The Chain Rule, #49

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