APFIVE Second Derivative of a Polar Curve
For the polar curve $$r = 4\cos(3\theta)$$, what is the value of $$\frac{d^2y}{dx^2}$$ at $$\theta = \frac{\pi}{6}$$?
A
Undefined
B
3
C
$$-\frac{4\sqrt{3}}{27}$$
D
0
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