A linear isoparametric displacement field of a beam element is defined as where and are the absolute nodal displacements of the first node, and and are the absolute nodal displacements of the...

A linear isoparametric displacement field of a beam element is defined as

where

and

are the absolute nodal displacements of the first node, and

and

are the absolute nodal displacements of the second node. Show that this isoparametric displacement field can be used to describe an arbitrary rigid body displacement.