humm...I get
1/2ln(x^2 + 4) - 2arctan(x/2)
can someone double check for me? I'm pretty sure its right
Ah. Oops. Your right.No, it's -2*arctan(x/2). grouchy's answer is correct. What's your problem? I think you are forgetting the dx part. Differentiate the given answer to check.