Fuente TeX:

h(0,0) + \frac{\partial h}{\partial x}(0,0)x + \frac{\partial h}{\partial y}(0,0)y + \frac{1}{2}\frac{\partial^2 h}{\partial x^2}(0,0)x^2 + \frac{\partial^2 h}{\partial x \partial y}(0,0)xy + \frac{1}{2}\frac{\partial^2 h}{\partial y^2}(0,0)y^2.