In 49 and 50, use the substitution t = -x to solve the given initial-value problem on
Chapter 3, Problem 49(choose chapter or problem)
In 49 and 50, use the substitution t = -x to solve the given initial-value problem on the interval (-oo, 0).4.x2y" + y = 0, y(-1) = 2,y'(-1) = 4
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