# Trisecting an Angle Using Tschirnhaus's Cubic

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This Demonstration illustrates a property of Tschirnhaus's cubic, which has polar equation . Namely, that the angle between the tangent and the normal to the radius vector at a given point on the curve is one-third of the polar angle of the point.

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Contributed by: Izidor Hafner (January 2013)

Open content licensed under CC BY-NC-SA

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The curve is also known as Catalan's trisectrix or l'Hospital's cubic.

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