1<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 2 <mrow> 3 <msub> 4 <mi>x</mi> 5 <mrow> 6 <mi>N</mi> 7 <mo>+</mo> 8 <mn>1</mn> 9 </mrow> 10 </msub> 11 <mspace width="1em"/> 12 <mo>=</mo> 13 <mspace width="1em"/> 14 <msub> 15 <mi>x</mi> 16 <mi>N</mi> 17 </msub> 18 <mo>−</mo> 19 <mfrac> 20 <mrow> 21 <mi>f</mi> 22 <mfenced> 23 <mrow> 24 <mi>x</mi> 25 </mrow> 26 </mfenced> 27 </mrow> 28 <mrow> 29 <mi>f</mi> 30 <mo>′</mo> 31 <mfenced> 32 <mrow> 33 <mi>x</mi> 34 </mrow> 35 </mfenced> 36 </mrow> 37 </mfrac> 38 <mo>−</mo> 39 <mfrac> 40 <mrow> 41 <mi>f</mi> 42 <mo>″</mo> 43 <mfenced> 44 <mrow> 45 <mi>x</mi> 46 </mrow> 47 </mfenced> 48 <msup> 49 <mfenced> 50 <mrow> 51 <mi>f</mi> 52 <mfenced> 53 <mrow> 54 <mi>x</mi> 55 </mrow> 56 </mfenced> 57 </mrow> 58 </mfenced> 59 <mn>2</mn> 60 </msup> 61 </mrow> 62 <mrow> 63 <mn>2</mn> 64 <msup> 65 <mfenced> 66 <mrow> 67 <mi>f</mi> 68 <mo>′</mo> 69 <mfenced> 70 <mrow> 71 <mi>x</mi> 72 </mrow> 73 </mfenced> 74 </mrow> 75 </mfenced> 76 <mn>3</mn> 77 </msup> 78 </mrow> 79 </mfrac> 80 </mrow> 81</math> 82