Only part b

Please explain specifically and give example

7. If the electric potential at a point (x, y) in the xy-plane is V(x, y) = e'zx cos(2y), then the electric intensity vector at (x, y) is E =VV(x, y). 4 b. Show that, at each point in the plane, the electric potential decreases most rapidly in the direction of the vector E. If a. Find the electric intensity vector at (, 0]