Section 14.3 Partial Derivatives
Ex: Contour Map Estimate
A contour map is given for a function \(f\). Use it to estimate \(f_x(2, 1)\) and \(f_y(2, 1)\). 
A contour map is given for a function \(f\). Use it to estimate \(f_x(2, 1)\) and \(f_y(2, 1)\).