Find the slope of the tangent line to the given polar curve at the point specified by the value of theta. r = cos(theta/3),    theta = pi

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.5: Polar Coordinates
Problem 64E
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Find the slope of the tangent line to the given polar curve at the point specified by the value of theta.

r = cos(theta/3),    theta = pi
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