Verify Stokes' theorem for the portion D of the surface z = tan¹ (y/x) which lies inside the cone x² + y² = z² and between the planes

z = 0 and

z = 2

by using the vector field

F = xz i + yz j (x² + y² ) k .

Hint: Parametrize the surface z = tan¹ (y/x) using polar coordinates