Fuente TeX:

\displaystyle \frac{\partial g}{\partial y}(0,0) = \frac{\partial f}{\partial x}(0,0)\frac{\partial h_1}{\partial y}(0,0) + \frac{\partial f}{\partial y}(0,0)\frac{\partial h_2}{\partial y}(0,0) = 7(-2)+7(1) = -7