e integrand in the problem 1+da can be re-written as a product, like this: (+) dx. apply integration by parts, we can let u = x, and dv= en du = 1dx, and v = arctanx. 1dx. 1+22 hat are the next steps for trying the integration by parts technique here? uv = fv du ==== x. arctan x - 1x dx =2.arctanz y +C uv-fvdu == 2. arctanz-farctan z dz Stop here and try a different approach, because we don't have a good way to antidifferentiate arct