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Steve Phelps
GeoGebra
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Volume by Disk/Washer around y
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apec
bewijs stelling van Pythagoras
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Angle at centre twice angle at circumference
heptagon 7-29-14 11-10am
david
Vertices of a Regular n-sided Polygon
Creating a line
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黎曼和（Riemann Sum）
積分
橢圓
雙曲線
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