2326.sagews

plot(cos, (-5,5))

x = var('x')
parametric_plot((cos(x),sin(x)^3),(x,0,2*pi),rgbcolor=hue(0.6))

L = [[6*cos(pi*i/100)+5*cos((6/2)*pi*i/100),\
   6*sin(pi*i/100)-5*sin((6/2)*pi*i/100)] for i in range(200)]
p = polygon(L, rgbcolor=(1/8,1/4,1/2))
t = text("hypotrochoid", (5,4), rgbcolor=(1,0,0))
show(p+t)

x, y = var('x,y')
plot3d(x^2 + y^2, (x,-2,2), (y,-2,2))