I need to find unit normal and tangent vectors for an ellipse with major axis ( ) of length and minor axis ( ) of length .

My initial guesses are

and

These are orthogonal, but lead to incorrect results later so I suspect they're wrong.

Anyone?

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- October 28th 2009, 03:35 AMpsdTangent and normal vectors for an ellipse
I need to find unit normal and tangent vectors for an ellipse with major axis ( ) of length and minor axis ( ) of length .

My initial guesses are

and

These are orthogonal, but lead to incorrect results later so I suspect they're wrong.

Anyone? - October 28th 2009, 03:51 AMtonio