[18 pts.] Pacemakers, which are devices designed to regulate heartbeats, typically produce square waveforms to stimulate heart tissue. These electrical pulses help manage irregular heart rhythms. Calculate the Fourier Transform of the square waveform defined below, and determine the first three Fourier series components using analytical methods.
$x(t) = \begin{cases} 1 & 0 \le t < \frac{1}{2}T_0 \\ 0 & \frac{1}{2}T_0 \le t < T_0 \end{cases}$
for $T_0 = 0.04$ sec.