Question: In Exercises 3538, (a) Find the critical points, (b) Test for relative extrema, (c) List the critical points for which the Second Partials Test fails,

In Exercises 35–38,

(a) Find the critical points,

(b) Test for relative extrema,

(c) List the critical points for which the Second Partials Test fails, and

(d) Use a computer algebra system to graph the function, labeling any extrema and saddle points.

f(x, y) = x3 + y3

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