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@interact
def _(n=[4..8],b=[round(.25+.05*i,2) for i in range(11)]):
var('x,y'); f=cos(x^n+y^n); t=3.
p=region_plot(
f<=b,(x,-t,t),(y,-t,t),
incol='#3636ff',plot_points=220)
p.show(figsize=(5,5))
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