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教学素材：正余弦函数及其反函数
Author:
清风拂琴，陌上花开
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
正方形雪花图案
异形操场
百分數及其應用
第八周作业1
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vbcvbcvbcvbcvbcvcv
test
中線定理(阿波羅尼奧斯)定理推廣一：斯圖爾(Stewart)定理
扇形在射线上滚动
長方形的對稱軸
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Vectors 2D (Two-Dimensional)
Integral Calculus
Addition
Histogram
Quadratic Functions