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USA AIME 2008

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#1
lyxuansang91

lyxuansang91

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Tìm số nguyên dương N sao cho :
$ \arctan \dfrac{1}{3} + \arctan \dfrac{1}{4} + \arctan \dfrac{1}{5} + \arctan \dfrac{1}{n}= \dfrac{\pi}{4} $
<span style='color: #FF8C00'><strong class='bbc'><em class='bbc'><span style='font-size: 36px;'>Em muốn học giỏi toán</span></em></strong></span>




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