[Putnam contest 2003] Minimum of |sinx + cosx + tanx + secx + cscx + cotx|

Описание: Let's find out the minimum of |sinx + cosx + tanx + secx + cscx + cotx|. A very interesting question yet need a lot of care in solving. Remember no calculator is allowed and only high school math level is enough to solve. Enjoy~

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