ข้อ 5 ข้อ 10 30/03/64
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- Inverse trigonometric functions
- Slope Intercept Form Game
- If a line segment joining two points subtends equal angles at two other points lying on the same side of the line containing the line segment, then the four points are concyclic
- Copie de El cercle trigonomètric i les principals raons d'un angle
- Fig5