- (D) Counterexamples are, respectively, for (A), f (x) = |x|, c = 0; for (B), f (x) = x^3 , c = 0; for
(C), f (x) = x^4 , c = 0; for (E), f (x) = x^2 on (−1, 1).
dmanu
(dmanu)
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