Find all points on the cardioid r = a(1 + cos ) where the tangent line is

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Find all points on the cardioid r = a(1 + cos θ) where the tangent line is
a. Horizontal, and
b. Vertical.
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Calculus

ISBN: 978-0131429246

9th edition

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

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