1. [9 pts] Solve the following differential equations and briefly describe your method of solution (choose three). a.x y" + xy'- (1-a x) y = 0 subject to y(0) = 0, y'(0) = B b. y" +4 y = x sin 2x subject to y(0) = y'(0) = 0 C. x y" xy' +y =x d. 2 y y" + 2 (v+ 3 y') y" + 2 (y')? = sin x +2 (v')? = sin x