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Gauss-Legendre quadrature abscissas and weights calculation
Given the lower and upper limits of integration x1 and x2, this routine returns arrays x and w of length n,
containing the abscissas and weights of the Gauss-Legendre n-point
quadrature formula.
Usage
import gauleg from 'gauss-legendre';
const { x, w } = gauleg(n, x1, x2);