Find the critical point(s) of f(x, y) = sin x + sin y + cos (x + y) for 0 and Classify each as a local maximum, local minimum, or a saddle point.
Show transcribed image textFind the critical point(s) of f(x, y) = sin x + sin y + cos (x + y) for 0 and Classify each as a local maximum, local minimum, or a saddle point.