... of (x tan^2 x). i don't know how to do it. pls help
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Feb 17, 2007 #2 cristo Staff Emeritus Science Advisor 8,142 74 Well, what have you tried? This is clearly homework! Try writing tanx in terms of sinx and cosx.
Feb 17, 2007 #3 O.J. 199 0 i tried that. i even tried using trig identities for the expansion of tan^2 but i got no where. I am lost...
i tried that. i even tried using trig identities for the expansion of tan^2 but i got no where. I am lost...
Feb 17, 2007 #5 ChaoticLlama 59 0 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).
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).
Feb 18, 2007 #6 cristo Staff Emeritus Science Advisor 8,142 74 Bruk, please read the PF guidelines here: https://www.physicsforums.com/showthread.php?t=5374, paying particular attention to the part re giving complete solutions to homework/textbook style questions.
Bruk, please read the PF guidelines here: https://www.physicsforums.com/showthread.php?t=5374, paying particular attention to the part re giving complete solutions to homework/textbook style questions.
Feb 18, 2007 #8 cristo Staff Emeritus Science Advisor 8,142 74 O.J. said: 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.
O.J. said: 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.