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Using that y1(x) =1/(1+x^2) is a solution of (1 +x^2)y + 4xy + 2y = 0 determine a fundamental set of solutions of the differential equation via reduction of order. a Answers -> y1(x) = 1 /(1+x)^2, y(x) = x/(x^2 + 1) These are the fundamental system of solutions.