诱导公式五（90°+α）的几何演示
2020-03-14 03:54
本GeoGebra范例通过几何作图与单位圆动态演示了三角函数的诱导公式五，即角度为90°+α时的正弦、余弦和正切值的变化规律。利用旋转、对称及坐标几何构造，直观展示了sin(90°+α)=cosα，cos(90°+α)=-sinα等核心公式的几何意义，帮助学习者深入理解三角函数在不同象限的符号与数值转换关系。
所属专题
中职数学GeoGebra互动教学资源库
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