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Let  $x(t)=10 \cos (10.5 W t)$ be passed through an LTI system having impulse response $h(t)=\pi\left(\frac{\sin W t}{\pi t}\right)^{2} \cos 10 Wt$. The output of the system is

  1. $\left(\frac{15 W}{4}\right) \cos (10.5 W t)$
  2. $\left(\frac{15 W}{2}\right) \cos (10.5 W t)$
  3. $\left(\frac{15 W}{8}\right) \cos (10.5 W t)$
  4. $(15 W) \cos (10.5 W t)$

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