The signal $x[n]=\sin(\pi n/6)/(\pi n)$ is processed through a linear filter with the impulse response $h[n]=\sin(\omega_cn)/(\pi n)$ where $\omega_c>\pi/6$. The output of the filter is
- $sin(2\omega_cn)/(\pi n)$
- $sin(\pi n/3)/(\pi n)$
- $[sin(\pi n/6)/(\pi n)]^2$
- $sin(\pi n/6)/(\pi n)$