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任意角的三角函数
Author:
S CHOW
GeoGebra
New Resources
画直线等分三角形的面积
畫出對稱圖形
兩位數除以一位數（二）
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
Discover Resources
How to draw a decagon with ruler and compasses?
动点
modulus and argument of z
旋转的圆锥内接锥体.许兴华数学
光圈与正多边形外角和
Discover Topics
Trigonometric Functions
Similar Triangles
Definite Integral
Ratios
Right Triangles