Identify which of the following equations is exact.
(2xy)dx+(x2+y)dy=0(2xy)dx + (x^2 + y)dy = 0(2xy)dx+(x2+y)dy=0
(y)dx+(x+1)dy=0(y)dx + (x+1)dy = 0(y)dx+(x+1)dy=0
(2xy)dx+(x2+x)dy=0(2xy)dx + (x^2 + x)dy = 0(2xy)dx+(x2+x)dy=0
(2x+y)dx+(x+2y)dy=0(2x+y)dx + (x+2y)dy = 0(2x+y)dx+(x+2y)dy=0