(a) Determine all residues of the following function 1 f(z) (z+4)(z-1)3 C (b) Evaluate the contour integral I = fc f(z) dz, for the function f (z) and curve C, if Cencloses both singular points, and if Cencloses only one of them, say the one at z = 1. Q.5) (20 p.) Obtain general solutions of the differential equations defined as: 2 (a) yy" + y + 2x = 0. dx (b) - y dy - 2x + 3y dt =-