Sketch the variations of the shape functions Nj and Nm, given by Eqs. (6.2.18), over the surface

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Sketch the variations of the shape functions Nj and Nm, given by Eqs. (6.2.18), over the surface of the triangular element with nodes i, j, and m. Check that Ni 1Nj 1Nm 51 anywhere on the element. 

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