Ñeà Taøi : VEÕ ÑOÀ THÒ AÙP 3 PHA HÌNH SIN TREÂN 3 CÖÛA SOÅ KHAÙC NHAU x=linspace(0,5*pi,550);% cho x chay tu o den 4 pi voi 550 mau >> y1=6*sin(x); >> y2=6*sin(x+2*pi/3); >> y3=6*sin(x-2*pi/3); >> figure(1) >> plot(x,y1,'r-'); >> %set axis limits and grid lines >> grid on >> xlabel('time') >> ylabel('Amplitude') >> legend('First') >> title('3 phase_sin plot') >> %ve do thi thu 2 >> firuge(2) >> figure(2) >> plot(x,y2,'g-'); >> % set axis limits and lines >> % set axis limits and grid lines >> xlabel('Time') >> y label('Amplitude') >> legend('second') >> title('3 phase_sin plot') >> % ve do thi thu 3 >> figure(3) >> plot(x,y3,'g-'); >> xlabel('time') >> ylabel('Amplitude') >> legend('third') >> title('3 phase_sin plot') >>  ... legend('second') >> title( '3 phase _sin plot') >> % ve thi thu >> figure (3) >> plot(x,y3,'g-'); >> xlabel('time') >> ylabel('Amplitude') >> legend('third') >> title( '3 phase _sin plot') >> ...>> title( '3 phase _sin plot') >> %ve thi thu >> firuge(2) >> figure(2) >> plot(x,y2,'g-'); >> % set axis limits