Problem #7: Consider the first order linear differential equation: (cosx)y' + (sinx)y = 4 cos'x sin.x (a) Which of the following is a suitable choice of integration factor? (b) If in addition we're given the initial condition y(x/3) = 9, does this initial value problem have a unique solution? (A) No such factor exists (B) tanx (C) e six (D) sec x (E) cosx (F) e cos x Problem #7(a): Select v (A) No (B) Yes Problem #7(b): Select v