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 November 12th, 2008, 11:35 PM #1 Newbie   Joined: Nov 2008 Posts: 1 Thanks: 0 How would you evaluate these indefinite integrals? sin(lnx)/x and x/x+x^4 iIve been trying to understand how to do these for the past few hours but no luck any ideas?
 November 13th, 2008, 04:08 AM #2 Member   Joined: Jun 2008 Posts: 45 Thanks: 0 Re: How would you evaluate these indefinite integrals? Well, first is $\int \frac{\sin(\ln(x))}{x}dx=\int \sin(\ln(x))d(\ln(x))=-\cos(\ln(x))+const$. Can't understand where do you have problems with second integral, or you have written it incorrectly?
November 13th, 2008, 11:24 AM   #3
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If you meant x/(x + x^4), cancel x and then use partial fractions. If you still can't finish, show what you can do.

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