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x = cos x 的解析形式
source link: https://zhuanlan.zhihu.com/p/36297534
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玩计算器的发现大家都玩过计算器吧, 不知注意到没有.输入任意数, 然后不断按\mathtt{cos\ ANS}最后总会输出0.739085.什么, 你说明明记得是:0.999847? 哦, 因为你用了角度制.这一系列操作等价于求解方程x=\cos x, …
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