If $y ( \theta ) = \frac { 2 \cos \theta + \cos 2 \theta } { \cos 3 \theta + 4 \cos 2 \theta + 5 \cos \theta + 2 }$, then at $\theta = \frac { \pi } { 2 } , y ^ { \prime \prime } + y ^ { \prime } + y$ is equal to :\\
(1) $\frac { 1 } { 2 }$\\
(2) 1\\
(3) 2\\
(4) $\frac { 3 } { 2 }$