1.
(3z^2y^3z^3+yz)i
(3x^2y^2z^3+xz)j
(3x^3y^3z^2+xy)k
df/dx=(0)i
+(6y^2z^3x+z)j+
(9y^2z^2x^2+y)k
df/dy=(9z^5y^2+z
+(6x^2yz^3)j+
(9x^3z^2y^2+x)k
df/dz=(15y^3z^4+y)i
+(9x^2y^2z^2+x)j+
(6x^3y^3z)k
This makes vector field
not conservative.
2.
Int(5y)dx+10x(dy)(C)
(x,y|0<=x<=1 and 
0<=y<=1) 
5/2 -> 25/2