dovid – Resources – GeoGebra

Convex 2.0
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Lagrangean example
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Tangent plane with gradient vector
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Partial derivatives 2.0
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Cramer's method line
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Cramer's solution to singular system in R3
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Contour sets (lower and upper)
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Non-homogeneous system in R3 (0 d.f.)
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Helicopter path
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Number 6 as surface
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