tana=√3/3,怎么求a的度数(要具体过程)改一下tana=-√3/3,怎么求a的度数,答案是150度,怎么求的
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![tana=√3/3,怎么求a的度数(要具体过程)改一下tana=-√3/3,怎么求a的度数,答案是150度,怎么求的](/uploads/image/z/3713725-37-5.jpg?t=tana%3D%E2%88%9A3%2F3%2C%E6%80%8E%E4%B9%88%E6%B1%82a%E7%9A%84%E5%BA%A6%E6%95%B0%EF%BC%88%E8%A6%81%E5%85%B7%E4%BD%93%E8%BF%87%E7%A8%8B%EF%BC%89%E6%94%B9%E4%B8%80%E4%B8%8Btana%3D-%E2%88%9A3%2F3%2C%E6%80%8E%E4%B9%88%E6%B1%82a%E7%9A%84%E5%BA%A6%E6%95%B0%EF%BC%8C%E7%AD%94%E6%A1%88%E6%98%AF150%E5%BA%A6%EF%BC%8C%E6%80%8E%E4%B9%88%E6%B1%82%E7%9A%84)
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