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诱导公式三（x轴对称关系）
Author:
桃篮翁
GeoGebra
New Resources
拼砌四邊形
第八周作业
兩組對邊相等和有直角的四邊形
找出對稱軸
四邉形 (四年級) 教師版
Discover Resources
容積盒子(加蓋)
光的折射（光线自右下向左上）
cube
Tangent from an external point
棱柱
Discover Topics
Indefinite Integral
Median Value
Tangent Line or Tangent
Percentages
Sine