Did you mean ?
If so, remember log(a/b)=log a - log b.
You can then use integration by parts on ln (4x^2+1).
I have already used the integral calculator on wolfram, but that really isn't a solution. I know in this thread: <http://mathhelpforum.com/calculus/42341-integrate-ln-tanx-1-a.html> , he says on the 3rd to last line that someone had already solved this integral earlier, but I have no idea where this solution is. any help is greatly appreciated.