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75700$$ e^x = \sum_{n=0} \frac{x^n}{n!} $$61
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757ucup-team3591还能要吗。61
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757WhybullYMe举办一个魂喵,举办一个魂谢谢喵61
780enze114514空を見上げて、空を見つめて、空を楽しんで、答えはそこにある。60
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780taniya$$\prod_{n=1}^\infty (1-x^n)=\sum_{k=-\infty}^\infty(-1)^kx^{\frac{k(3k-1)}{2}}=\sum_{k=0}^\infty(-1)^kx^{\frac{k(3k\pm 1)}{2}}$$60
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