The equation for the first cycle \(\left(0 \leq t \leq T_{0}ight)\) of a periodic pulse train is

\[
v(t)=V_{\mathrm{A}}\left[-5 u(t)+5 u\left(t-T_{0} / 4ight)ight] \mathrm{V}
\]

(a) Sketch the first two cycles of the waveform.

(b) Derive expressions for the Fourier coefficients \(a_{n}\) and \(b\) \(n \cdot\)