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Birthday Buddies
作者：
Stephen Arnold
GeoGebra
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Fourier Lissajous (Mechanical)
Slope Between 2 Points (Phase 2)
Damped Trochoidal Curve
Random Polar Curve (3)
Trefoil Knot
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transformations by rotation
Triangle Angle Sum Theorem
test
JonathanFriedman_LabelingObjects
Reciprocal Function
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