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October 9th, 2012, 02:34 PM  #1 
Newbie Joined: Oct 2012 Posts: 10 Thanks: 0  Really need help with these two integration problems.
Hello I am really confused by these integrals. I know that this one requires a usubstitution first. u=tan(x) You then must write everything in terms of tangent. [attachment=3:2dyo6alo]gif.latex0001.gif[/attachment:2dyo6alo] This requires integration by parts. [attachment=2:2dyo6alo]gif.latex0000002.gif[/attachment:2dyo6alo] To save you some time: [attachment=1:2dyo6alo]gif.latexfsdfsdfsfs.gif[/attachment:2dyo6alo] and [attachment=0:2dyo6alo]gif.latexfsfsaaaaaaa.gif[/attachment:2dyo6alo] Please help me! 
October 9th, 2012, 06:21 PM  #2 
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: Really need help with these two integration problems.
1. Let , then , Then substitute into something, I think you can figure it out. 
October 9th, 2012, 09:25 PM  #3 
Newbie Joined: Oct 2012 Posts: 10 Thanks: 0  Re: Really need help with these two integration problems.
Thank you thank you thank you! Still stuck on the other problem. I know you do integration by parts but I can't get the solution. I know it's a messy problem. 
October 9th, 2012, 09:34 PM  #4 
Newbie Joined: Oct 2012 Posts: 10 Thanks: 0  Re: Really need help with these two integration problems.
I love how you did a tsubstitution there.

October 9th, 2012, 10:31 PM  #5  
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: Really need help with these two integration problems. Quote:
Don't worry, your problems are really timeconsuming. I'm working on it!  
October 9th, 2012, 11:10 PM  #6 
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: Really need help with these two integration problems.
2. 
October 10th, 2012, 06:54 AM  #7 
Newbie Joined: Oct 2012 Posts: 10 Thanks: 0  Re: Really need help with these two integration problems.
Thanks so much again! That must have taken a long time. If I knew you in real life, I'd give you a cookie. 
October 10th, 2012, 05:31 PM  #8  
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: Really need help with these two integration problems. Quote:
 

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