APFIVE Chain Rule with a Trigonometric Function
If $$ f(x) = \tan(3x^2 - \frac{\pi}{3}) $$, then $$ f'\left(\sqrt{\frac{\pi}{9}}\right) = $$ ?
A
$$ 6\sqrt{\pi} $$
B
$$ \frac{2\sqrt{\pi}}{3} $$
C
$$ \sec^2\left(-\frac{\pi}{3}\right) $$
D
$$ 2\sqrt{\pi} $$
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