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[" (c) "h(x)=x|x|],[" Let "f:R rarr R," ...

[" (c) "h(x)=x|x|],[" Let "f:R rarr R," where "f(x)=2^(|x|)-2^(-x)," then "f(x)" is "],[[" (A) one-one "," (B) many-one "],[" (C) periodic "," (D) none of these "]]

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