(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

I believe there might be a mistake in this statement from my online notes. A typo error in the last line, maybe?

http://s1.ipicture.ru/uploads/20111209/K6L7AWhS.jpg

The attempt at a solution

In the last line, from what i worked out, it should be (1/2)tan^(-1)(tanh... instead of 2tan^(-1)(tanh... Correct?

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# Homework Help: Integral of sech x

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