x=0:0.1:2*pi;
plot(x,sin(x),x,cos(x));
text(pi/4,sin(pi/4),'\leftarrow sin(q\pi/4)=0.707');
text(5*pi/4,cos(5*pi/4),'cos(5\pi/4) = -0.707 \rightarrow','HorizontalAlignment','right');