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The nodal coordinates and nodal temperatures of a tetrahedron simplex element are given by Node i: (Xi Yi, zi) =(0,0,0)mm, Ti=100C Node j: (Xje Yj, z;) = (20,0,0) mm, T;=80C Node k: (xter Yi Zi) = (0,30,0)mm, T = 120C Node 1: (x), Y, z) =(0,0,40) mm, T = 50C k5 Express the temperature variation in the element T(x, y, z), in terms of the shape functions