> plot (x+4*x^(-2),x=-10..10,y=-10..30);
> plot (5*x^6-3*x^5+10,x=-1.3..1.5);
> plot(x^4-8/3*x^3+5,x=-1.5..3.2);
> plot(x/(x+1)^2,x=-10..10,y=-5..0.3);
> plot(x/(x^2+4),x=-30..30);
> plot((x^2-1)/(x-2)^2,x=-25..30,y=-1..5);
> plot(x^4-5*x^2+4,x=-3..3);
> plot((x-4)/x^2,x=-40..40,y=-1..0.08);
> plot(sin(x)+cos(x),x);