高一这个三角函数诱导公式怎么推导出来的?sin(π+α)=-sinαsin(-α)=-sinαsin(π-α)=-tanα请问这三个公式是怎么推导出来的啊?还有,sin后面跟的弧度怎么还有负的阿尔法啊?弧度还有负数吗
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![高一这个三角函数诱导公式怎么推导出来的?sin(π+α)=-sinαsin(-α)=-sinαsin(π-α)=-tanα请问这三个公式是怎么推导出来的啊?还有,sin后面跟的弧度怎么还有负的阿尔法啊?弧度还有负数吗](/uploads/image/z/3007259-35-9.jpg?t=%E9%AB%98%E4%B8%80%E8%BF%99%E4%B8%AA%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E8%AF%B1%E5%AF%BC%E5%85%AC%E5%BC%8F%E6%80%8E%E4%B9%88%E6%8E%A8%E5%AF%BC%E5%87%BA%E6%9D%A5%E7%9A%84%3Fsin%EF%BC%88%CF%80%2B%CE%B1%EF%BC%89%3D-sin%CE%B1sin%EF%BC%88-%CE%B1%EF%BC%89%3D-sin%CE%B1sin%EF%BC%88%CF%80-%CE%B1%EF%BC%89%3D-tan%CE%B1%E8%AF%B7%E9%97%AE%E8%BF%99%E4%B8%89%E4%B8%AA%E5%85%AC%E5%BC%8F%E6%98%AF%E6%80%8E%E4%B9%88%E6%8E%A8%E5%AF%BC%E5%87%BA%E6%9D%A5%E7%9A%84%E5%95%8A%3F%E8%BF%98%E6%9C%89%2Csin%E5%90%8E%E9%9D%A2%E8%B7%9F%E7%9A%84%E5%BC%A7%E5%BA%A6%E6%80%8E%E4%B9%88%E8%BF%98%E6%9C%89%E8%B4%9F%E7%9A%84%E9%98%BF%E5%B0%94%E6%B3%95%E5%95%8A%3F%E5%BC%A7%E5%BA%A6%E8%BF%98%E6%9C%89%E8%B4%9F%E6%95%B0%E5%90%97)
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