In: Math
Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
a. f(x, y) = 2x3 + xy2 + 5x2 + y2 + 5
b. f(x, y) = x4 + y4 − 4xy + 3
c. f(x, y) = x3 − 48xy + 64y3