Elliptic Rotation

Author

Eric W. Weisstein
January 2, 2008

This notebook downloaded from http://mathworld.wolfram.com/notebooks/CoordinateGeometry/EllipticRotation.nb.

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

©2007 Wolfram Research, Inc. except for portions noted otherwise

Invariance

FullSimplify[x^2+y^2/.{x->x Cos[θ]-y Sin[θ],y->x Sin[θ]+y Cos[θ]}]

RotationMatrix[θ].{x,y}