GATE2016-1-6

Question

Which one of the following is an eigen function of the class of all continuous-time, linear, time-invariant systems ($u(t)$ denotes the unit-step function)?

• A. $e^{j\omega_0t}u(t)$
• B. $\cos(\omega_0t)$
• C. $e^{j\omega_0t}$
• D. $\sin(\omega_0t)$