The differential equation (-xy sinx + 2y cosx)dx + 2x cosxdy = 0 is
Select the correct answer.
A. not exact but having an integrating factor xy
B. exact with solution -xycosx + ysinx + 2xycosx =c
C. not exact but having an intehrating factor y
D. EXact with solution -xycosx + ysinx + 2xycosx +c
E. Exact with solution -2xycosx + ysinx +2xycosx = c ​