2. If exact, solve. If not use an integrating factor. Also, if an initial condition is given, find the corresponding particular solution. (a) 2xydx+x2dy = 0. (d) 2x tan ydx + sec² ydy = 0. (b) sin(x) cos(y)dx + cos(x) sin(y)dy = 0. (e) 2 cosh x cos ydx = sinh x sin ydy. (c) e30 (dr+3rd) = 0. (f) e2 (2 cos ydx - sin ydy) = 0 with y(0) = 0 I