r = 3+cos(theta) 와 r = 3-sin(theta)
var('theta')
p1=polar_plot(3+cos(theta), (theta, 0, 2*pi), color='red')
p2=polar_plot(3-sin(theta), (theta, 0, 2*pi), color='purple')
p1+p2
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r = 3+cos(theta) 와 r = 3-sin(theta)
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