Re: [考古] 91政大國貿

看板trans_math作者LuisSantos ( )時間17年前 (2008/06/29 12:52)推噓3(3推 0噓 2→)

留言5則, 2人參與討論串4/4 (看更多)

※ 引述《applexgreen (親愛的早安)》之銘言： : 2.(C) : 1 1 : lim ( ---------- － --------) : x→0 sin^2x x^2 : 好像看過類似的題目但是腦筋就是卡住... 1 1 lim (------------ - -----) x→0 (sin(x))^2 x^2 x^2 - (sin(x))^2 = lim (--------------------) x→0 (x^2)((sin(x))^2) x^2 - (sin(x))^2 x^2 = lim (------------------)(------------) x→0 x^4 (sin(x))^2 x^2 - (sin(x))^2 x = (lim ----------------)((lim --------)^2) x→0 x^4 x→0 sin(x) 2x - sin(2x) = (lim ------------)(1^2) x→0 (4)(x^3) 2 - (2)(cos(2x)) = lim ------------------ x→0 (12)(x^2) (4)(sin(2x)) = lim -------------- x→0 24x 1 sin(2x) 1 1 = (---)(lim ---------) = (---)(1) = --- 3 x→0 2x 3 3 : 3. Find constants a and b for which : π : F(a,b)=∫[sinx-(ax^2+bx)]^2 dx : 0 : is a minimum : http://www.lib.nccu.edu.tw/exam/transfer/it/it91.pdf 如果看不清楚題目可以看原檔 : 先謝謝你:-) -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.119.29.31

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applexgreen

06/29 14:17, , 1^F

06/29 14:17, 1^F

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applexgreen

06/29 14:21, , 2^F

06/29 14:21, 2^F

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applexgreen

06/29 14:38, , 3^F

06/29 14:38, 3^F