Find the slope of the tangent line to the polar curve
r
=
4
−
2
cos
(
θ
)
\displaystyle {r}={4}-{2}{\cos{{\left(\theta\right)}}}\ \
r
=
4
−
2
cos
(
θ
)
at
θ
=
π
6
\displaystyle \theta=\frac{\pi}{{6}}
θ
=
6
π
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