来自《耶鲁大学开放课程：基础物理 第11集 第11集》

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  If this number is smaller than this number,
  如果这个数比这个数小
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  the reciprocal of this number
  那么这个数的倒数
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  is bigger than the reciprocal of this number.
  就比这个数的倒数大
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  Three is smaller than ten; 1/3 is bigger than 1/10.
  三比十小 1/3 就比 1/10 大
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  Same thing.
  同样的道理
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  So, I'm somehow used to tangent better than the cot,
  相对余切来说 我比较习惯使用正切
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  so I flip this over and I flip that over
  所以我将这一项和那一项翻转一下
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  and I also changed less than to bigger than.
  并且将小于号变成大于号
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  This way we can understand
  这样一来我们就知道
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  tan(θ) has to be bigger than some number.
  tan(θ) 的值比某个数字要大
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  That means θ has to be bigger than some number,
  也就是说 θ 必定大于某个值
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  because tan(θ) increases with θ.
  因为 tan(θ) 随 θ 的增大而增大