1<?xml version='1.0'?> 2<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN' 3 'http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd' 4 [<!ENTITY mathml 'http://www.w3.org/1998/Math/MathML'>]> 5<html xmlns='http://www.w3.org/1999/xhtml'> 6<head><title>atanh2</title> 7<!-- MathML created with MathCast Equation Editor version 0.89 --> 8</head> 9<body> 10<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 11 <mrow> 12 <mtext>atanh</mtext> 13 <mfenced> 14 <mrow> 15 <mi>x</mi> 16 </mrow> 17 </mfenced> 18 <mo>≈</mo> 19 <mi>x</mi> 20 <mo>+</mo> 21 <mfrac> 22 <msup> 23 <mi>x</mi> 24 <mn>3</mn> 25 </msup> 26 <mn>3</mn> 27 </mfrac> 28 <mspace width="1em"/> 29 <mo>;</mo> 30 <mspace width="1em"/> 31 <mi>x</mi> 32 <mo><</mo> 33 <mroot> 34 <mi>ε</mi> 35 <mi/> 36 </mroot> 37 </mrow> 38</math> 39</body> 40</html> 41