APFIVE Slope of a Tangent Line
What is the slope of the line tangent to the graph of $$y=\ln(\cos(x))$$ at $$x=\frac{\pi}{6}$$?
A
$$-\frac{1}{2}$$
B
$$\frac{1}{\sqrt{3}}$$
C
$$\frac{\sqrt{3}}{3}$$
D
$$-\frac{\sqrt{3}}{3}$$
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