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三角函數由來= =
Author:
陳柄何
GeoGebra
New Resources
四邉形 (四年級) 教師版
球体的体积推导
兩組對邊相等的四邊形
兩位數除以一位數（二）
找出對稱軸
Discover Resources
sine graph (reduce to 1/2 and then translate leftward by 15 degree)
四次函數圖形觀察
門格海綿
reflection points
六芒星
Discover Topics
Similarity Transformation or Similarity
Planes
Function Graph
Mode
Perimeter