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Number of Normals to a Curve
The normals to the green curve are tangent to the evolute of the curve. The number of normals passing through the given point changes when crossing the evolute.
Contributed by:
Maxim Rytin
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Number of Normals to a Curve
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http://demonstrations.wolfram.com/NumberOfNormalsToACurve/
Contributed by:
Maxim Rytin
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