14. For each of the following sets, show whether it is convex or not.
(a) ? = {(?1, ?2 ) ? ∈ ? 2 : ?1 + ?2 ≤ 2, ?1 ≥ 0, ?2 ≥ 0}
(b) ? = {(?1, ?2 ) ? ∈ ? 2 : ?2 − ?1 2 = 0}
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