Lemma
EasyRelated rates
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §4.2 Implicit Differentiation and Related Rates, #12 · Calculus · Related rates

Show that the circles … and … are tangent at the point…

Show that the circles and are tangent at the point .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §4.2 Implicit Differentiation and Related Rates, #12

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