Evaluate the Integral $$\int _ { x / 6 } ^ { x / 3 } \frac { 3 \ln ( \tan x ) } { 7 \sin x \cos x } d x$$

Evaluate the integral.
$$\int _ { x / 6 } ^ { x / 3 } \frac { 3 \ln ( \tan x ) } { 7 \sin x \cos x } d x$$