Codigo MATLAB SENOS + COSENOS

Ahi les dejo la primera parte de la tarea. Chequenla cualquier comentario es bienvenido

x=0.01:0.01:2*pi;

s1=sin(x);

s2=cos(x);

Z1=s1+s2;

Z2=-s1+s2;

Z3=-s1-s2;

Z4=s1-s2;

plot(x,Z1,'r');

hold

plot(x,Z2,'g');

plot(x,Z3,'c');

plot(x,Z4,'b');

set(gca,'XTick',0:pi/4:2*pi);

set(gca,'XTickLabel',{'0','pi/4','pi/2','3pi/4','pi','5pi/4','3pi/2','7pi/4','2pi'});

text(pi/8,cos(pi/8)+sin(pi/8),'\leftarrow cos + sen',...

'HorizontalAlignment','left')

text(11*pi/8,-cos(11*pi/8)+sin(11*pi/8),'\leftarrow - cos + sen',...

'HorizontalAlignment','left')

text(7*pi/8,-cos(7*pi/8)-sin(7*pi/8),'\leftarrow - cos - sen',...

'HorizontalAlignment','left')

text(3*pi/8,cos(3*pi/8)-sin(3*pi/8),'\leftarrow cos - sen',...

'HorizontalAlignment','left')

grid on