[腦殘] 看錯
∫(xln x) dx
=> ∫ln x d(1/2 x^2) = 1/2 x^2 * ln x - ∫1/2 x^2 d(ln x)
=> 1/2 x^2 *ln x - 1/2 ∫x^2 *1/x dx
=> 1/2 x^2 *ln x -1/4 x^2 + C
這樣對嗎~~摳區!!
明天要去上FOURIER喔~~我的位置在第九排~~面對黑板左手邊的走道旁
不知道的話跟工讀生問一下座位表~~工讀生很漂亮喔!!
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