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Which of the following functions is convex, concave, both or neither? Why? (a) it) : H31||2 , f : R 9R 0)) it) : HHIIIE,

Which of the following functions is convex, concave, both or neither? Why? (a) it) : H31||2 , f : R\" 9R 0)) it) : HHIIIE, f : R" 9R (c) f(:v):ac\

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