Other
Platonic Realms: Conics
This resource provides in depth information on the conic sections. Click on the underlined words for definitions and diagrams.
University of Georgia
University of Georgia: Investigating Tangents: Rotation of Axes
An explanation of the rotation of axes and the equations involved in the process. Includes diagrams, explanations and formulas.
Other
The Krell Institute: Project: Rotation of Axes
This resource provides an explanation of the equation for rotation of axes with conic sections includes an example with an ellipse.