Are the following functions strictly convex, strictly concave, or neither?
(a) f(x) = In x – x2 + x0.6 + x – 10, for x > 0.
(b) f(x) = 3x4 – 2 In x –5x0.3 – 2x + 4, for x > 0.
(c) f(x) = – In x + x3 + x2 – 1, for x > 0.
(b) for x1 > 0, x2 > 0.
(e) for x1 > 0, x2 > 0.
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