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Let f: R->R be a function defined by f(x...

Let `f: R->R` be a function defined by `f(x)=(e^(|x|)-e^(-x))/(e^x+e^(-x))` . Then, `f` is a bijection (b) `f` is an injection only (c) `f` is surjection on only (d) `f` is neither an injection nor a surjection

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