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Key Stage 4 (Senior Secondary)‎ > ‎4.2 Measures, Shape & Space 度量、圖形與空間‎ > ‎More about trigonometry 續三角‎ > ‎

任意角的三角比

http://www.geogebratube.org/material/show/id/33705 (Download GeoGebra file)
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