三角函数的精确值
2014-12-17 05:30
本GeoGebra范例演示了如何利用几何构造（如圆、三角形、多边形和向量）来推导和展示三角函数的精确值。通过交点、线段、距离和角度的计算，直观呈现了三角函数在特定角度下的几何意义与精确数值，适合用于三角学与几何的教学与探索。
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<expression label="o" exp="round(round(α) / 30) ≟ round(α) / 30" />
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<expression label="fortyfiveAngle" exp="round(α) ≟ 135° ∨ round(α) ≟ 225° ∨ round(α) ≟ 315°" />
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<expression label="text11" exp=""\left(\fgcolor{" + (LaTeX[xColour]) + "}{\frac{\sqrt{2}}{2}},\fgcolor{" + (LaTeX[yColour]) + "}{-\frac{\sqrt{2}}{2}}\right) "" />
<element type="text" label="text11">
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<condition showObject="round(α) ≟ 315° ∨ d"/>
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