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u,v=var('u,v'); f=cos(3*u)-cos(16*u)*sin(5*v)
def color_f(u,v): return abs(sin(u+v))
spherical_plot3d(f,(u,0,2*pi),(v,0,2*pi),
frame=False,plot_points=50,
color=(color_f,colormaps.hot))
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