directional derivative

1. (10 points) Consider the following function f: R2 + R: f(7) = z *” (2 %) 7+?” ( 3 ) +6 (a) Find the directional derivative of f at (:) in the direction (6) (b) Find all points that satisfy the FONC for f. (c) Does f has a minimizer? If it does, then find all minizer(s); otherwise, explain why it does not.
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