The question is: Determine the deflection and rotation for a simple supported beam using FEM . The bending rigidity for the beam is EI. Im struggling to derive the 3 point bending deflection equation of -PL^3/48EI Using FEM. I can get the built in beam deflection equation of -PL^3/192EI using the following method: jpg image hosting But when i do it for a simply supported beam i am struggling to figure out which way to go. So far i have gotten this far. png image hosting I think my problem is i do not know how to deal with the slope acting at the two supports, Any help would be appreciated.