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2a x2y3 - x2y2 x3yi - xt y3 Xly2 - x2y, yi - yi x-\ — x2 0 0 0

where a is equal to the area of the element.

Substituting from eqn. (9.87) into eqn. (9.85), utilising the result for [A]-1, i.e. eqn. (9.88), and writing concisely the result of the matrix multiplication, gives

u(x, y)

0 0

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