Re: [考古] 91政大企管
※ 引述《freshcute (咕嚕咕嚕)》之銘言:
: sinx - arctanx
: lim ------------------ =
: x->0 (x^2)ln(1+x)
: @@ 不知道該如何下手 請問要怎麼解呢
: ( 答案是 1/6 )
引入Marclaurin's Series:
1 1
sinx = x - ----x^3 + ----x^5 - ...... + C
3! 5!
-1 1 1
tan x = 1 - ---x^3 + ---x^5 - ...... + C
3 5
1 1
㏑|1+x| = x - ---x^2 + ---x^3 - ...... + C
2 3
{x-(x^3/3!)+(x^5/5!)-......}-{x-(x^3/3)+(x^5/5)-......}
∴原 = lim ------------------------------------------------------------
x→0 (x^2){x-(x^2/2)+(x^3/3)-......}
(1/3) - (1/3!) 1
= ---------------- = ---
1 6
--
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◆ From: 220.137.77.45
※ 編輯: Imbufo 來自: 220.137.77.45 (07/09 19:28)
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07/09 19:30, , 1F
07/09 19:30, 1F
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04/22 17:57,
5年前
, 18F
04/22 17:57, 18F
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