Find the gradient vector field of f(x,y,z)=3x2+6y2+4z2\displaystyle {f{{\left({x},{y},{z}\right)}}}=\sqrt{{{3}{x}^{{2}}+{6}{y}^{{2}}+{4}{z}^{{2}}}}

\displaystyle {\langle} , , \displaystyle {\rangle}