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两角和与差的余弦、正弦公式(动画2)

Author:叶卢庆

New Resources

  • 画直线等分三角形的面积
  • 探究三角形的全等條件
  • 直線的斜率:水平變化 & 鉛垂變化
  • 球体的体积推导(优化版)
  • 双心四边形

Discover Resources

  • 折扣 例4
  • 整數或分數÷分數_ 工作紙(一)_題2b
  • 行進波
  • 橢圓規Ellipsograph (Trammel of Archimedes)
  • 在数轴上表示根号数-表格区

Discover Topics

  • Incircle or Inscribed Circle
  • Inequalities
  • Trigonometry
  • Algebra
  • Parabola
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