x=0:pi/50:pi;
y1=cos(2*x);
y2=sin(x).*sin(6*x);
plot(x,y,'r*',x,y2,'b-');grid on
title('曲线y1=cos(2x)与曲线sin(x)sin(6x)')
xlabel('x轴'),ylabel('y轴')
gtext('y1=cos(2x)') ,gtext('y2=sin(x)sin(6x)')
legend('y1=cos(2x)','y2=sin(x)sin(6x)')