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# Use Chain Rule to Compute Derivative, Inverse Trig Function

APCALC-U7Z815

$\cfrac{d}{dx} \tan^{-1}(2x)$ at $x=\cfrac{1}{2}$ equals:

A

$\cfrac{\pi}{4}$

B

$\cfrac{1}{2}$

C

$1$

D

$\sqrt{2}$