Find the first partial derivatives of $f(x,y,z) = z \ \arctan(\frac{y}{x})$ at the point (5, 5, 2).

A. $\frac{\partial f}{\partial x}(5, 5, 2) =$

B. $\frac{\partial f}{\partial y}(5, 5, 2) =$

C. $\frac{\partial f}{\partial z}(5, 5, 2) =$

Your overall score for this problem is