Hedgehog

Author

Eric W. Weisstein
March 16, 2008

This notebook downloaded from http://mathworld.wolfram.com/notebooks/PlaneCurves/Hedgehog.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/Hedgehog.html.

©2008 Wolfram Research, Inc. except for portions noted otherwise

Formula

Solve[
{
x Cos[θ]+y Sin[θ]==p[θ],
-x Sin[θ]+y Cos[θ]==p'[θ]
},
{x,y}
]//Simplify