<?xml version='1.0'?>
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN'
  'http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd'
  [<!ENTITY mathml 'http://www.w3.org/1998/Math/MathML'>]>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head><title>atanh2</title>
<!-- MathML created with MathCast Equation Editor version 0.89 -->
</head>
<body>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mtext>atanh</mtext>
    <mfenced>
      <mrow>
        <mi>x</mi>
      </mrow>
    </mfenced>
    <mo>&#x2248;</mo>
    <mi>x</mi>
    <mo>+</mo>
    <mfrac>
      <msup>
        <mi>x</mi>
        <mn>3</mn>
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      <mn>3</mn>
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    <mspace width="1em"/>
    <mo>;</mo>
    <mspace width="1em"/>
    <mi>x</mi>
    <mo>&lt;</mo>
    <mroot>
      <mi>&#x03B5;</mi>
      <mi/>
    </mroot>
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</math>
</body>
</html>