Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §14.4 Cylindrical and Spherical Coordinates, #9 · Multivariable Calculus · Change of variables

Find the polar angle … for the point with cylindrical coordinates

Find the polar angle $ϕ$ for the point with cylindrical coordinates $r θ z$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §14.4 Cylindrical and Spherical Coordinates, #9

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