Epispiral

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An epispiral with equation r(θ)=2sec(2θ)
An epispiral with equation r(θ)=2sec(2θ)

The epispiral is a plane curve with polar equation

\ r=a \sec{n\theta}.

There are n sections if n is odd and 2n if n is even.

It is the polar or circle inversion of the rose curve.

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