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z = xy-y^2
Author:
Steve Phelps
The surface
with the tangent plane at
.
GeoGebra
New Resources
History of Maths
Cross Product in 2D and 3D
Ellipse, Hyperbola and Circle as Envelopes
Angles and Intersecting Lines: Quick Investigation
Stairs (Optical Illusion)
Discover Resources
Try this surprising discovery in Geometry!
Transformation of Quadratic Functions 1
Cavalieri's Principle
i pick my nose
pantheon
Discover Topics
Expected Value
Tangent Line or Tangent
Logarithm
Equations
Angles