% index exercise 2 answer

x = [0:360]; 
y = sin(x*pi/180); 
ip=y>0;
in=y<0;
plot(x(ip),y(ip),'b')
hold on
plot(x(in),y(in),'r')
z = cos(x*pi/180);
plot(x,z,'c')
ii=y<0 & z<0;
plot(x(ii),z(ii),'bo')