721.sagews

plot(sin, (-5,5))

plot(cos, (-2*pi,2*pi), rgbcolor=(1,1,5))

v = [(2*cos(x)+exp(x)/45,x) for x in srange(-2*float(pi),2*float(pi))]
line(v)

v = [(arctan(x)*sin(x)+4*exp(sin(45*x)),x) for x in srange(-2*float(pi),2*float(pi),0.01)]
show(line(v), xmin=0, xmax=13)

f = lambda x,y: cos(x*y)
contour_plot(f, (-10, 10), (-10, 10))

x, y = var('x,y')
plot3d(3*x^2+9*exp(y)-14587*sin(x), (x,-2*pi,2*pi), (y,-2*pi,2*pi))

u, v = var('u,v')
fx = u*v
fy = u
fz = v^2
parametric_plot3d([fx, fy, fz], (u, -1, 1), (v, -1, 1),
   frame=False, color="yellow")

c = circle((0,0), 1, rgbcolor=(1,15,0))
c.show()