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Descartes’ four-circle solution Consider the four mutually tangent circles shown in the figure that have radii a, b, c, and d, and curvatures A = 1/a, B = 1/b, C = 1/c, and D = 1/d. Prove Descartes’ result (1643) that
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Calculus: Early Transcendentals (3rd Edition)
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