For each of the following functions determine whether it is convex, concave, quasiconvex, or quasiconcave. (a) f(x)= e²-1 on R. (b) f(x1, x2) = x122 on R²+. (c) f(x1, x2) = 1/(x122) on R²+. (d) f(x1,₂)= 1/2 on R²+.

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