Which method of approach is useful for evaluating four noded quadratic elements?

Which method of approach is useful for evaluating four noded quadratic elements? Correct Answer Gaussian quadrature approach

Gaussian quadrature is to select the n Gauss points and n weights such that provides an exact answer for polynomials f(ξ) of as large ∼ degree as possible. In other words, the Idea is that if the n-point integration formula is exact for all polynomials up to as high a degree as possible, then the formula will work well even if f is not a polynomial.
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