I do not know how to integrate
$$\int{\arctan{x} \over 1+x^2}dx$$
The answer is given to be: $\arctan{x} + 1/2 \ln{|1+x^2|}+C$
I'd appreciate your help very much. Thanks!
Edit 1: it must be done with substitution only.
Edit 2: Yes. It's not the answer. Thank you all. I'll delete this in a minute. Thanks!!