Let be a function defined by

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

Let

f:\mathbb{R}\to\mathbb{R}

be a function defined by

f(x)=\frac{e^{|x|}-e^{-x}}{e^x+e^{-x}}

. Then

f(x)

is (a) One-one function (b) Onto function (c) Neither one-one nor onto function (d) One-one onto function