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scutoid3
Author:
王必欣
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不存在的三角函数
Graph of Quadratic Function
傅里叶级数 Fourier series
程自顺100
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gggggf
Angles in a Circle(圓上的角)
生活中的平面圖形問題2
幂函数
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Geometry
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Reflection or Reflexion
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