1. Let F(x, y, z) = (x cos y)i + (yx)j + (z sin y)k be a vector field on R. Let : R R be a function defined by f(x, y, z) = et + z cos (xy). (a) Find the gradient of f. (b) Find the divergence and curl of F. Fully simplify your answers. 2. Let F(x, y, z) = (xy)i + (yz)j + (xz)k be a vector field on R. Verify by computation, not using a theorem, that V (V x F) = 0, i.e. that the divergence of the curl of Fis zero.