यदि $y(\theta) = \frac{2 \cos \theta + \cos 2 \theta}{\cos 3 \theta + 4 \cos 2 \theta + 5 \cos \theta + 2}$ है,तो $\theta = \frac{\pi}{2}$ पर $y'' + y' + y$ का मान ज्ञात कीजिए।

  • A
    $\frac{3}{2}$
  • B
    $1$
  • C
    $\frac{1}{2}$
  • D
    $2$

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