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

Author:Alex CHIK

Topic:Cosine, Sine, Trigonometry

Move the green points. 拖拉綠色點改變魚桿的長度和角度。

gMath 互動數學教室 http://www.geogebra.hk

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