I have been doing a parametric arc length problem and have my integrand reduced to (2-2cost)^(1/2). How do I go about integrating this. I tried by parts and u-sub and failed. I think I can use a trig sub but how do I make (2cost) into a square. Is this possible, and if it is is there an easier way.

Would I use (2)^(1/2)*cos^(1/2)[t]