Suppose that MATLAB is used to plot a sinusoidal signal. The following MATLAB code generates the signal and makes the plot.

a$)$ Derive a formula for the signal;

b$)$ Explain what each line of code does

c$)$ Then run it in MATLAB and include the resulting properly labeled plot.

d$)$ What should be the unit on $x$ axis?

close all, clear,

$Fs=100$;$tt=-0\mathrm{.}8$:$\frac{1}{F}s$:$1$;$T=0\mathrm{.}5$

$SS={200}^{***}$exp$(j^{***}(2^{***}\frac{}{T^{***}}(tt-0\mathrm{.}75)))$;

$=$real$(ss)$;

figure,

subplot$(211),$ plot$(1000$tt$(1$:end$-15),$ xx$(16$:end$),\text{'}--$r$\text{'}),$ grid on

title$($ 'Plot of $?????????\text{'}),$ xlabel$($ 'Time $(???)\text{'}),$ ylabel$($ 'Signal' $)$