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  2. Putting 3D in Perspective Question 3: Verifying our Projection with Sight Lines

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  3. Understanding derivative with geogebra.

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  4. Mean value theorem with GeoGebra.

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  5. Putting 3D in Perspective Question 2: Projecting a 3D Line to 2D

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  6. Building on the Shoulders of Giants: 1998 Putnam Exam A1, 2.0 in GeoGebra 3D

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  7. A Geometric Algebra Solution to a Hard Contest Problem

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