1) 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 theimportant aspects of the function. (Enter your answers as acomma-separated list. If an answer does not exist, enter DNE.)
f(x, y) =7ycos(x),    0 ≤x ≤ 2π
| local maximum value(s)Â Â Â Â | | | Â Â |
| local minimum value(s)Â Â Â Â | | | Â Â |
| saddle point(s)Â Â Â Â | (x, y, f) | = |
2)
Find the local maximum and minimum values and saddle point(s) ofthe function. If you have three-dimensional graphing software,graph the function with a domain and viewpoint that reveal all theimportant aspects of the function. (Enter your answers as acomma-separated list. If an answer does not exist, enter DNE.)
f(x, y) = 4 − x4 + 2x2 − y2
| local maximum value(s) | Â Â Â Â | | Â Â |
| local minimum value(s) | Â Â Â Â | | Â Â |
| saddle point(s) | Â Â Â Â | (x, y, f) = | Â Â |
