Prove that the limit is infinity..

kakos22 · 2010-04-18, 13:21

Let g is a continuous function and lim(x->oo) g(x)=oo.We define
function f(x)=e^(-x) ∫_0^x g(t)e^tsin(x-t)dt
prove that lim(x->oo) f(x)=oo

Good luck..if something is not clear let me know

cheesehead · 2010-04-18, 20:05

You've already been posting about this math in a thread (http://mersenneforum.org/showthread.php?t=13271, "extremely difficult problem with a function") in the Homework Help section.

All the folks who are willing to help will do so in the Homework Help thread. Starting a new thread in another section isn't the proper way to get help with this.

kakos22 · 2010-04-18, 20:20

I am really sorry i didn't know that i had to post it to the Homework Help thread..
this problem is different from the other and i thought that i could post it here too..
if this is a problem i will remove it..just tell me how..

cheesehead · 2010-04-18, 21:12

Quote:

Originally Posted by kakos22

I am really sorry i didn't know that i had to post it to the Homework Help thread..

It could go in the Math subforum if it's not really a homework problem.

The difference is that Homework Help is designed to be for giving small hints to folks working on school homework problems, not working out entire answers for them. Respondents there are supposed to limit themselves to suggesting just a small amount of help at a time.

Quote:

this problem is different from the other and i thought that i could post it here too..
if this is a problem i will remove it..just tell me how..

No big deal. Forum moderators can move it to Math (unless you say it's homework).

kakos22 · 2010-04-18, 23:18

oh..i didn't notice that is a math forum..yes my problems next time has to been sent there because there are not homework but more like big problems form university..I am sorry one more time...about the problem, i found out that is false so don't waste your time anymore with it..if the moderators want can erase this thread..thanks a lot

2010-04-18, 13:21	#1
kakos22 Apr 2010 17 Posts	Prove that the limit is infinity.. Let g is a continuous function and lim(x->oo) g(x)=oo.We define function f(x)=e^(-x) ∫_0^x g(t)e^tsin(x-t)dt prove that lim(x->oo) f(x)=oo Good luck..if something is not clear let me know

2010-04-18, 20:05	#2
cheesehead "Richard B. Woods" Aug 2002 Wisconsin USA 2²·3·641 Posts	You've already been posting about this math in a thread (http://mersenneforum.org/showthread.php?t=13271, "extremely difficult problem with a function") in the Homework Help section. All the folks who are willing to help will do so in the Homework Help thread. Starting a new thread in another section isn't the proper way to get help with this. Last fiddled with by cheesehead on 2010-04-18 at 20:11

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2010-04-18, 20:20	#3
kakos22 Apr 2010 21₈ Posts	I am really sorry i didn't know that i had to post it to the Homework Help thread.. this problem is different from the other and i thought that i could post it here too.. if this is a problem i will remove it..just tell me how..

2010-04-18, 23:18	#5
kakos22 Apr 2010 17 Posts	oh..i didn't notice that is a math forum..yes my problems next time has to been sent there because there are not homework but more like big problems form university..I am sorry one more time...about the problem, i found out that is false so don't waste your time anymore with it..if the moderators want can erase this thread..thanks a lot