function[a,b,c,d]=funzioni
x=-pi:0.01:pi;
a=sin(3*x);
b=cos(2*x);
c=tan(2*x);
d=(sin(2*x))./(cos(2*x));

subplot(4,1,1),plot(x,a)
subplot(4,1,2),plot(x,b)
subplot(4,1,3),plot(x,c)
subplot(4,1,4),plot(x,1)