If we convolve $\sin (t) / t$ with itself, then we get
- $C \sin (t) / t$ for some constant $C$
- $C \cos (t) / t$ for some constant $C$
- $C \cos (t) / t^{2}$ for some constant $C$
- $C_{1} \sin (t) / t^{2}+C_{2} \cos (t) / t^{2}$ for some constants $C_{1}, C_{2}$
- None of the above