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有关圆锥曲线切线的一组性质
Author:
孙广仁
GeoGebra
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apec
Exploding cube
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complete-square-form-r2
Circle Theorems in One File
Contact angle (LuCY Model)
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startburst_newpack
H1.12
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Right Triangles
Incircle or Inscribed Circle
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Secant Line or Secant
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