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Proof without words: Cosine Rule (餘弦公式)
Author:
Alex CHIK
Topic:
Cosine
GeoGebra
Source: Nelsen, R. B. (1993). Proofs without Words - Exercises in Visual Thinking. The Mathematical Association of America. GeoGebra 互動數學教室
http://www.geogebra.hk
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