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这题函数在[0, PI / 2]不是单峰的,三分做法是错的。。

Posted by RYANaaa at 2011-12-27 17:40:20 on Problem 3301
两个点就不对
两个点是(0, 7), (6, 0)时 角度为(0-> 0.7左右)递增, 然后递减到1.49, 再递增。
设以AB为对角线的正方形的边与x的夹角为a, 是在(a + k * PI / 2, a + k * PI + PI / 2)处为凸的

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