Let $\displaystyle f(x)= \frac{3 \sin x}{4 \sin x + 2 \cos x}$.

Then $f'(x) =$ .

The equation of the tangent line to $y=f(x)$ at $a = \pi/3$ can be written in the form $y=mx+b$ where
$m =$ and
$b =$ .

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