If $y = y ( x )$ is the solution of the differential equation $\frac { d y } { d x } + ( \tan x ) y = \sin x , 0 \leq x \leq \frac { \pi } { 3 }$, with $y ( 0 ) = 0$, then $y \left( \frac { \pi } { 4 } \right)$ is equal to\\
(1) $\frac { 1 } { 4 } \log _ { e } 2$\\
(2) $\left( \frac { 1 } { 2 \sqrt { 2 } } \right) \log _ { e } 2$\\
(3) $\log _ { e } 2$\\
(4) $\frac { 1 } { 2 } \log _ { e } 2$