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Maths-

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Question

$f colon R not stretchy rightwards arrow R$ is a function defined by $f left parenthesis x right parenthesis equals fraction numerator e to the power of ∣ x end exponent minus e to the power of negative x end exponent over denominator e to the power of x plus e to the power of negative x end exponent end fraction. text Then end text f stack stack text is end text with _ below with _ below$

one-one and onto
one-one but not onto
onto but not one-one
neither one-one nor onto

The correct answer is: neither one-one nor onto

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