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Obtain terms to order k, in powers of (x - zo) of the general solution of each of the following equations, where & and co are shown alongside each equation. Also find an interval of convergence of each series solution. 9. W - xy' + 2y = 0, k - 7.10 = 0. 10. 2(#'+ 8)y" + 2ry' + (=+ )y - 0, - 4, 10 - 0. 11. my" +v - 27-0, -40 =1. 12. y" y = sin , k - 5, In -0.\f\f