(1-tan^2π/12)/(tanπ/12)化简
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/17 01:28:49
(1-tan^2π/12)/(tanπ/12)化简
![(1-tan^2π/12)/(tanπ/12)化简](/uploads/image/z/19748613-21-3.jpg?t=%281-tan%5E2%CF%80%2F12%29%2F%28tan%CF%80%2F12%29%E5%8C%96%E7%AE%80)
(1-tan^2π/12)/(tanπ/12)
=2*(1-tan^2π/12)/(2tanπ/12)
=2/(tanπ/6)
=2√3/3
再问: =2*(1-tan^2π/12)/(2tanπ/12) =2/(tanπ/6) 这里我没办法理解啊
再答: tan2a=2tana/(1-tan^2a) 就是这个公式取倒数
=2*(1-tan^2π/12)/(2tanπ/12)
=2/(tanπ/6)
=2√3/3
再问: =2*(1-tan^2π/12)/(2tanπ/12) =2/(tanπ/6) 这里我没办法理解啊
再答: tan2a=2tana/(1-tan^2a) 就是这个公式取倒数
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