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3)Area of triangle 0.5absinC with 2 different angles
Author:
Pong Hai Lin
GeoGebra
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球体的体积推导
祖冲之的期望：内棋与外棋
探究三角形的全等條件
平行線的斜率
讀磅
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選擇合適的「中間人」
Book
Control a, b and c in quadratic function
拋物線6--包絡線法
Illusion-外凸的正方形
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Polynomial Functions
Inequalities
Quadratic Equations
Geometry
Square