作者vampirefish (driving my freedom)
站內CSMATH
標題Re: 問各微積分小問題
時間Fri Sep 24 17:29:50 2004
※ 引述《sweeten (不想要開學><)》之銘言:
: d/dx ln cosx= -tanx
d/dx ln a = 1/a
d/dx 1/cosx = -sinx/cosx = -tanx
using the chan rule(pro some spell error, but u know it, right?)
is that what u want?
it's seens too easy...............I am not sure
: d(tan- y/x)=(xdy-ydx)/(x平方+y平方)
it's a procial differnciation problem, right?
is that tan(-y/x)??
or other else..................well just let me know
: 有沒有人會證明勒 幫忙一下吧~~
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◆ From: 64.175.247.74
推 sandor:chain rule,不過比我厲害了 現在的我要想 140.113.163.81 09/25
→ sandor:一下才行,mathematica把我寵壞了 >_< 140.113.163.81 09/25