14. Look up the expressions for the nine-node quadratic quadrilateral element (Lag element). Discuss its properties and compare it to the eight-node quadratic quad element.
14. Look up the expressions for the nine-node quadratic quadrilateral element (Lag element). Discuss its properties and compare it to the eight-node quadratic quad element. What is the basic difference between the Lagrangian element and its eigh quadratic quadrilateral counterpart
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