作者Highhuman (Ryan)
看板trans_math
标题[考古] 渐进线
时间Tue Jul 3 19:40:56 2012
lnx
Suppose f:(0,oo) -> R such that f(x) = -----------
1+(lnx)^2
(a)Find the asymptotic lines of the graph y = f(x) , if exist.
这题渐进线怎知道它长怎样?! 然後,要怎麽求?!
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◆ From: 111.249.226.104
1F:推 kria5304:x->∞时f(x)=0 水平渐近线就是y=o125.226.226.200 07/03 19:43
2F:→ kria5304:求水平渐近线就用x->∞,f(x)=k y=k即解125.226.226.200 07/03 19:44
3F:→ kria5304:求垂直渐近线就用f(x)->∞,x=k x=k即解125.226.226.200 07/03 19:46
4F:→ kria5304:求斜渐近线用y=ax+b代入 求ab125.226.226.200 07/03 19:47
5F:→ Highhuman:所以这样看来,这题渐进线是y=0 ?!111.249.226.104 07/03 19:51
6F:推 kria5304:yes125.226.226.200 07/03 20:07
7F:→ Highhuman:soga~111.249.226.104 07/03 20:10