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Tangent Planes to Quadratic Surfaces


	Four different quadratic functions are used to define surfaces. You can vary the point of tangency. The tangent plane is given by the first-order Taylor polynomial approximation .


	Contributed by: Gerhard Schwaab and Chantal Lorbeer
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Quadratic (Wolfram MathWorld)

Quadratic Surface (Wolfram MathWorld)

Tangent Plane (Wolfram MathWorld)

"Tangent Planes to Quadratic Surfaces" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TangentPlanesToQuadraticSurfaces/

Contributed by: Gerhard Schwaab and Chantal Lorbeer

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