(2 n(Ew1=0(则 X EIw- Q Erw XB Whet do the first and second row represent? potent ial energy for the beam elewer T (we)=Ee e dwe '+we ge dx dx PUe-2(2- ee sele Whot do the last four tems represent? clattoⅥ of ba asis uncoV Need twlce-differentiable, Continuous, continuous- sLope functions. The miniMum polynowisl order should be Hree so that non-end shears are obtained st Hie nodes. The wbic polnowidd also gives us for para eters to fit the four essenti