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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
New Resources
兩組對邊相等和有直角的四邊形
拼砌四邊形
Claude 解幾何題
算柱 (兩位數)
第八周作业
Discover Resources
正方變十字
面鏡的反射
平行四邊形柱算體積(可以切開)
選修數學
Copy of 正方體的反射對稱1
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Cylinder
Straight Lines
Trapezium
Step Functions
Conic Sections