III. Calculate the divergence of the vector field. a) F(x,y)=xi+2y2j b) F(x,y,z)=xzi-2xzj+yzk and evaluate at the point (2,1,3).

Calcule la divergencia del campo vectorial. a F (x,y) =x2i+2y2j 6) F(x,y,z) =x2zi- 2xzj + yzk y evaluaten el punto (2, 1, 3)