Science:Math Exam Resources/Courses/MATH105/April 2012/Question 05 (b)/Hint 1

Recall the definition of the gradient:

$\mathrm{\nabla }H(x,y)=⟨\frac{\partial H}{\partial x}(x,y),\frac{\partial H}{\partial y}(x,y)⟩$

To use part (a), write H in terms of F and G.