作者EggAche (蛋疼)
看板trans_math
标题[积分] 97 元智资工 曲线弧长
时间Thu Nov 19 14:25:00 2015
4. Find the arc length for the curve y = x^2 - lnx taking from x = 1
to x = 3
y'(x) = 2x - 1/x
Length = ∫ds = ∫√[1+(y')^2] dx from 1 to 3
似乎没办法积出来？也不太容易改成以 dy 积分？
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