Logarithms, Explained - Steve Kelly

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In the 1990s, John Sylvan was drinking 30-40 cups of terrible office coffee a day. He noticed the problem: make a whole pot and it goes stale, or nobody agrees on what type to brew. So he invented the K-Cup—a small plastic pod you pop in a machine for one perfect cup in 30 seconds. He teamed up with his college roommate Peter Dragone and named the company Keurig, Dutch for “excellence.” The plan was simple: offices skip Starbucks, get their coffee at work. It would actually be environmentally ne

sier数学xioo分部积分法逆天海离薇求解三角函数不定积分∫xsinx/(x sinx)^2dx，这类结果不唯一经常求导数验证不同正确答案可以快速凑微分。

#分部积分法#【不定积分结果不唯一】逆天海离薇发现并求解∫((arctanx)^2/x^5)dx，对数是logarithm的Lnx不是专升本inx。