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how to integrate arc tangent x

i don't know what are the techniques in integrating in calculus

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Kenneth G. | Experienced Tutor of Mathematics and StatisticsExperienced Tutor of Mathematics and Sta...
The answer given is a very nice application of integration by parts (see  Bravo for that!  But it uses the derivative of the arctangent (which is not derived in the solution presented) - but you can find it at:
But you could also simply look up the formula for the artan integral at
Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)
Use integration by parts,
∫arctan x dx
= x arctan x - ∫x darctan x
= x arctan x - ∫x/(1+x^2) dx
= x arctan x - (1/2)ln(1+x^2) + c