\begin{tabular}{|l|l|}
\hline Q.36 & Which one of the options given is the inverse Laplace transform of $\frac{1}{s^{3}-s} ?$ \\
& $u(t)$ denotes the unit-step function. \\
\hline
- & $\left(-1+\frac{1}{2} e^{-t}+\frac{1}{2} e^{t}\right) u(t)$ \\
\hline - & $\left(\frac{1}{3} e^{-t}-e^{t}\right) u(t)$ \\
\hline - & $\left(-1+\frac{1}{2} e^{-(t-1)}+\frac{1}{2} e^{(t-1)}\right) u(t-1)$ \\
\hline - & $\left(-1-\frac{1}{2} e^{-(t-1)}-\frac{1}{2} e^{(t-1)}\right) u(t-1)$ \\
\hline
\end{tabular}