function bai8

a= input(' nhap a:');

b= input(' nhap b:');

x=linspace(-10,10,100);

y1=a*cos(x) + b* sin(x) ;

y2=cos(a*x)+sin(b*x) ;

y3=(a*cos(x)+b*sin(x))./(cos(a*x)+sin(b*x)) ;

y4=(cos(a*x)+sin(b*x))./(a*cos(x)+b*sin(x)) ;

subplot(1,2,1)

hold on

plot(x,y1);

plot(x,y2);

subplot(1,2,2)

hold on

plot(x,y3);

plot(x,y4);