Na certain region, the electric potential due to a charge distribution is given by the equation v(x, y,z)=3(x^2)(y^2) +y(z^3) - 2x(z^3), where x, y, and z are measured in meters and v is in volts. calculate the magnitude of the electric field vector at the position (x, y,z)=(1.0,1.0,1.0).