Indefinite Integral(arctan(x/2) / (x^2 + 4) )dx (sorry, I can't get my word equation editor to paste it here) I have stared at this problem for a while, but I can't figure it out. I made the triangle that has tan = x/2, and that triangle has a hypotenuse of sqrt(4 + x^2). But that doesn't seem to get me anywhere. Also, I thought using a u-substitution by u = arctan(x/2) would work, because it would get rid of the arctan, but thats not leading me anywhere either. Could someone point me in the right direction?