Hi, I have been given this question and can only get so far, I'm having trouble with the last part. Any help is good thanks
Last edited by mr fantastic; May 29th 2011 at 01:04 PM. Reason: Re-titled.
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First of all, when you let , you also need to change the terminals. and . So Go from here.
Last edited by Prove It; May 29th 2011 at 08:07 AM.
Thanks Prove It. I don't understand how and . What does mean? Do you substitute somewhere?
Originally Posted by dix Thanks Prove It. I don't understand how and . What does mean? Do you substitute somewhere? Yes, note that is the same as writing when x =0 (ie the zero in the bracket) then u = 0 because we know that u = sin x. Same idea for the upper limit.
Oh right, thanks. I had my calculator in degrees instead of radians so it came out different. I'm supposed to end up with 2(e-1), could you tell me where i've went wrong here?
You are evaluating , not . The whole point in changing your terminals when you make the substitution is so that you DON'T have to convert the integral back to a function of .
Oh right. Thanks again.
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