1. The set of functions {Po, P₁, Pn} in [a, b] is called a set of orthonormal functions, with respect to a weight function w(x), if a) fw(x) n(x) m(x) dx = 0 b) fw(x) Pn(x) n(x) dx = n c) Sw(x) Pn(x) Pm (x) dx = 1 d) None of the above a O

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