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sinα + sinβ > 0 ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
兩位數加法
第八周作业
找出對稱軸
判斷球體
兩位數除以一位數（一）
Discover Resources
銳角三角函數
時鐘
(003)80102史巧薇
Shoot Game
錯角---不平行綫
Discover Topics
Solids or 3D Shapes
Stochastic Process or Random Process
Median Line
Arithmetic
Trigonometric Functions