Trigonometric Ratios: Cosine & Tangent 三角比：餘弦和正切

運用情境介紹三角比。

Alex CHIK — March 21, 2013 - 2:46 AM

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License: CC-BY-SA, GeoGebra Terms of Use
Based Upon: Trigonometric Ratios: Sine 三角比：正弦
Shared by Alex CHIK
Derived Resources: Concept of Similarity 相似的概念
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