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def _(a=[3,4,5,6],b=[3,4,5,6]):
var('x,y,z'); c=colormaps.jet(8*a*b)[:3]
f=a*(cos(x)+cos(y)+cos(z))+b*cos(x)*cos(y)*cos(z)
p=implicit_plot3d(
f,(x,-b,b),(y,-b,b),(z,-b,b),mesh=True,
plot_points=10,opacity=.5,color=c)
p.show(frame=False)
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