INtegration by substitution followed by parts:

  • #1
199
0
... of (x tan^2 x). i don't know how to do it. pls help
 
  • #2
Well, what have you tried? This is clearly homework! Try writing tanx in terms of sinx and cosx.
 
  • #3
i tried that. i even tried using trig identities for the expansion of tan^2 but i got no where. I am lost...
 
  • #4
any ideas?
 
  • #5
this is by-parts integration because you have two functions multiplied by each other.
But before you do that you should use a trig identity (think of an identity which will give you an easily integratable trig function).
 
  • #7
Good work though :P
 
  • #8
any ideas?

Hint: Do you know an identity for tan2x in terms of, say, sec2x?

Try using this then integrate by parts. Post your work so we can help you.
 

Suggested for: INtegration by substitution followed by parts:

Replies
8
Views
955
Replies
4
Views
787
Replies
7
Views
742
Replies
7
Views
1K
Replies
11
Views
810
Replies
3
Views
772
Back
Top