Which of the following differential equations is exact?
(2xy)dx+(x2)dy=0(2xy)dx + (x^2)dy = 0(2xy)dx+(x2)dy=0
(y)dx+(x)dy=0(y)dx + (x)dy = 0(y)dx+(x)dy=0
(x2+y)dx+(x+y2)dy=0(x^2+y)dx + (x+y^2)dy = 0(x2+y)dx+(x+y2)dy=0
All of the above