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AP® Calculus AB-BC

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Moderate

Horizontal Tangent Lines with Polar Coordinates

APCALC-FWMZ34

Where is the tangent line to the graph of the polar equation $r=5\sin{\theta}$ horizontal?

A

$\theta=\cfrac{\pi}{2}$ only

B

$\theta=0$ and $\theta=\cfrac{\pi}{2}$

C

$\theta=\cfrac{\pi}{4}$

D

There are no horizontal points of tangency