415.sagews

L = [[cos(pi*i/100),sin(pi*i/100)] for i in range(200)]
p = polygon(L, rgbcolor=(1,1,0))
p.show()

L = [[-1+cos(pi*i/100)*(1+cos(pi*i/100)),\
   2*sin(pi*i/100)*(1-cos(pi*i/100))] for i in range(200)]
p = polygon(L, rgbcolor=(1/8,3/4,1/2))
p.show(axes=false)

L = [[2*cos(pi*i/100)*sqrt(1-sin(pi*i/100)^2),\
   2*sin(pi*i/100)*sqrt(1-sin(pi*i/100)^2)] for i in range(200)]
p = polygon(L, rgbcolor=(1/8,1/4,1/2))
p.save()

L = [[6*cos(pi*i/100)+6*cos((6/2)*pi*i/100), \
6*sin(pi*i/100)-6*sin((6/2)*pi*i/100)] 
    for i in range(200)]
p = polygon(L, rgbcolor=(1/8,1/4,1/2))
p.save()

f = lambda x,y: cos(x)^2 - sin(y)^2
C = contour_plot(f, (-4, 4), (-4, 4))
show(C)

sage: x = var('x')
sage: p3 = parametric_plot((cos(x),sin(x)^3),0,2*pi,rgbcolor=hue(0.6))
sage: p2 = parametric_plot((cos(x),sin(x)^2),0,2*pi,rgbcolor=hue(0.4))
sage: p1 = parametric_plot((cos(x),sin(x)),0,2*pi,rgbcolor=hue(0.2))
sage: (p1+p2+p3).save(axes=false)