INtegration by substitution followed by parts:

  • Thread starter O.J.
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  • #1
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... of (x tan^2 x). i dunno how to do it. pls help
 

Answers and Replies

  • #2
cristo
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Well, what have you tried? This is clearly homework! Try writing tanx in terms of sinx and cosx.
 
  • #3
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i tried that. i even tried using trig identities for the expansion of tan^2 but i got no where. im lost...
 
  • #4
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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
Gib Z
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Good work though :P
 
  • #8
cristo
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Science Advisor
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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.
 

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