Multiple choice

The signal x (t) is described by x (t) =$ \begin{cases} 1 & for \ -1 \le t \le + 1 \\ 0 & otherwise \end{cases}

$ Two of the angular frequencies at which its Fourier transform becomes zero are

  1. $\pi$, 2$\pi$
  2. 0.5$\pi$, 1.5$\pi$
  3. 0, $\pi$
  4. 2$\pi$, 2.5$\pi$
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Explanation