Given Code

F0=13;
T0=1/F0;
Ts=0.07;
t=0:Ts:13*T0;
x=real(exp(j*(2*pi*F0*t-pi/2)));
plot(t,x)
grid on

Too large Step(Ts)

Correct code

F0=13;
T0=1/F0;
Ts=0.0007;
t=0:Ts:13*T0;
x=real(exp(j*(2*pi*F0*t-pi/2)));
plot(t,x)
grid on

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