∂f∂x\frac{\partial f}{\partial x}∂x∂f en (500,1000)=172.36(500,1000)=172.36(500,1000)=172.36, ∂f∂y\frac{\partial f}{\partial y}∂y∂f en (500,1000)=36.93(500,1000)=36.93(500,1000)=36.93