为什么左边=右边,
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:2024/06/16 13:40:28
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为什么左边=右边,
![为什么左边=右边,](/uploads/image/z/12998326-22-6.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88%E5%B7%A6%E8%BE%B9%3D%E5%8F%B3%E8%BE%B9%2C)
1/2 ln (1-cosx)/ (1+cosx)
=1/2 ln (1-cosx)*(1- cosx)/ (1+cosx)*(1-cosx)
=1/2 ln (1-cosx)^2 / sinx^2
=ln [ (1-cosx)^2 / sinx^2 ]^1/2
=ln (1-cosx) / sinx
=ln | 1 / sinx -cosx / sinx |
=ln | csc x -cot x |
=1/2 ln (1-cosx)*(1- cosx)/ (1+cosx)*(1-cosx)
=1/2 ln (1-cosx)^2 / sinx^2
=ln [ (1-cosx)^2 / sinx^2 ]^1/2
=ln (1-cosx) / sinx
=ln | 1 / sinx -cosx / sinx |
=ln | csc x -cot x |