Find and classify the stationary points of the following functions: (a) f (x, y) = x 3

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Find and classify the stationary points of the following functions:
(a) f (x, y) = x3 + y3 − 3x − 3y 

(b) f (x, y) = x3 + 3xy2 − 3x2 − 3y2 + 10

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