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Trigonometric Ratios: Sine 三角比：正弦的複本

Author:Tam Tsai Ngai, Alex CHIK

Topic:Sine, Trigonometry

Drag 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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