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ptcc trigo level 2
Author:
Cheung Wing Chuen
GeoGebra
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兩組對邊相等的四邊形
【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
算柱 (兩位數)
兩位數除以一位數（二）
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直線之美
兩點距離
葛爾崗點
Choose the most suitable 'improvised units'(中間人)
平面截圆锥面
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Logarithm
Step Functions
Orthocenter
Linear Programming or Linear Optimization
Matrices