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# Compute Derivative of Product of Logarithmic and Trig Functions

APCALC-NJN46Z

Find $\cfrac{dy}{dx}$ at $x=\pi$ when $y=\sec x \cdot \ln x$.

A

$\cfrac{1}{\pi}$

B

$-\cfrac{1}{\pi}$

C

$-\cfrac{1}{\pi}+\ln \pi$

D

Nonexistent.