MATLAB: How to plot signal for equation given below

Question

Equations are 1) Sin^2(wt)/t 2) sin(at)sinh(at)/2(a^2) 3) ((e^-t)+(e^-3t))u(t)

Answer 1

Try this

t = linspace(0, 10, 100);
w = 1;
a = 1;
y1 = sin(w*t)./t;
y2 = sin(a*t).*sinh(a*t)./(2*a^2);
y3 = (exp(-t)+exp(-3*t)).*heaviside(t);
subplot(3,1,1)
plot(t, y1)
subplot(3,1,2)
plot(t, y2)
subplot(3,1,3)
plot(t, y3)