2. (a) Briey describe how orthogonal polynomials can be used to fi nd the nodes of Gaussian quadra-ture rules for a weighted integral ∫ a b f ( x ) w ( x ) d x . \int_{a}^bf(x)w(x)\mathrm{d}x. ∫abf(x)w(x)dx.(b) Using your described approach to find th…