看不懂这题的解法.1.是怎么得出cos不等于零的?怎么判断的呢?2.怎么的到那个有tan的式子的呢?变化的过程是怎么样的啊?
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![看不懂这题的解法.1.是怎么得出cos不等于零的?怎么判断的呢?2.怎么的到那个有tan的式子的呢?变化的过程是怎么样的啊?](/uploads/image/z/3726563-59-3.jpg?t=%E7%9C%8B%E4%B8%8D%E6%87%82%E8%BF%99%E9%A2%98%E7%9A%84%E8%A7%A3%E6%B3%95.1.%E6%98%AF%E6%80%8E%E4%B9%88%E5%BE%97%E5%87%BAcos%E4%B8%8D%E7%AD%89%E4%BA%8E%E9%9B%B6%E7%9A%84%3F%E6%80%8E%E4%B9%88%E5%88%A4%E6%96%AD%E7%9A%84%E5%91%A2%3F2.%E6%80%8E%E4%B9%88%E7%9A%84%E5%88%B0%E9%82%A3%E4%B8%AA%E6%9C%89tan%E7%9A%84%E5%BC%8F%E5%AD%90%E7%9A%84%E5%91%A2%3F%E5%8F%98%E5%8C%96%E7%9A%84%E8%BF%87%E7%A8%8B%E6%98%AF%E6%80%8E%E4%B9%88%E6%A0%B7%E7%9A%84%E5%95%8A%3F)
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