★三角函数有哪几种定义?★据说三角函数有不止一种甚至好几种定义,请分别列举出来!
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![★三角函数有哪几种定义?★据说三角函数有不止一种甚至好几种定义,请分别列举出来!](/uploads/image/z/3003985-1-5.jpg?t=%E2%98%85%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E6%9C%89%E5%93%AA%E5%87%A0%E7%A7%8D%E5%AE%9A%E4%B9%89%3F%E2%98%85%E6%8D%AE%E8%AF%B4%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E6%9C%89%E4%B8%8D%E6%AD%A2%E4%B8%80%E7%A7%8D%E7%94%9A%E8%87%B3%E5%A5%BD%E5%87%A0%E7%A7%8D%E5%AE%9A%E4%B9%89%2C%E8%AF%B7%E5%88%86%E5%88%AB%E5%88%97%E4%B8%BE%E5%87%BA%E6%9D%A5%21)
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