In some cases when dealing with vectofields an such the are integral has to be expressed in terms of r(t).
the general form for r is r^2=(r*cos(t)-a)^2+(r*sin(t)-b)^2, When I solve this in maple it seems like I get the inverse of the desired result.
If I knew that was always the case I could just inverse my result to get the right expression for r, but im not sure if it only applies for this particular cas or all cases.
I would be happy if anyone took a quick look and suggested a way to obtain the desired solution for any center (a,b) for the circle.
I would also happily like to know how I can solve for the range r can take, obviously in the example i´m working with here r starts at 0, but that is not always the case i guess.
Thank you, your help is much apperciated