Show that the curvature of the polar curve r2 = cos 2 is directly proportional to r

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Show that the curvature of the polar curve r2 = cos 2θ is directly proportional to r for r > 0.
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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