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任意角的三角函数
Author:
GeoGebra Institute of WuXi
GeoGebra
New Resources
百分數及其應用
平行線的判定
斐波那契螺旋弧线（表格法-可动态调节）
盈利與虧蝕
撒针估算面积实验
Discover Resources
對數的遞增或遞減(底數大於1)
兩個圓的中點軌跡
Introduction to Trigonometry from a Unit Circle
Golden Spiral
工具：PlaneText, PlaneArrow
Discover Topics
Trapezoid
Optimization Problems
Probability
Tangent Line or Tangent
Perimeter