和角的正弦与余弦：探索与发现
2015-12-23 04:31
本交互式数学范例旨在引导学生探索两角和的正弦与余弦公式。通过几何构造与动态拼图探究，直观展示和角公式的几何意义。范例利用点、垂线、多边形等对象，结合角度与距离测量，帮助学习者深入理解三角恒等式的推导过程，是三角函数教学的优质互动资源。
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平行四边形
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