Lemma
EasyVector calculus
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §15.2 Line Integrals, #5 · Multivariable Calculus · Vector calculus

… and …: any closed circle of radius 3

Compute the line integrals.

and : any closed circle of radius 3.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §15.2 Line Integrals, #5

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