<math  xmlns="http://www.w3.org/1998/Math/MathML" display="block" ><mtable columnalign="left" class="align">                 <mtr><mtd columnalign="right" class="align-odd"><msub><mrow ><mi >R</mi></mrow><mrow ><mi >F</mi> </mrow></msub ><mrow ><mo class="MathClass-open">(</mo><mrow><mi >x</mi><mo class="MathClass-punc">,</mo><mi >y</mi><mo class="MathClass-punc">,</mo><mi >z</mi></mrow><mo class="MathClass-close">)</mo></mrow></mtd>                 <mtd class="align-even"> <mo class="MathClass-rel">=</mo> <mn>2</mn><msub><mrow ><mi >R</mi></mrow><mrow ><mi >F</mi> </mrow></msub ><mrow ><mo class="MathClass-open">(</mo><mrow><mi >x</mi> <mo class="MathClass-bin">+</mo> <mi >&#x03BB;</mi><mo class="MathClass-punc">,</mo><mi >y</mi> <mo class="MathClass-bin">+</mo> <mi >&#x03BB;</mi><mo class="MathClass-punc">,</mo><mi >z</mi> <mo class="MathClass-bin">+</mo> <mi >&#x03BB;</mi></mrow><mo class="MathClass-close">)</mo></mrow><mspace width="2em"/></mtd>                 <mtd columnalign="right" class="align-label"></mtd>                 <mtd class="align-label">                 <mspace width="2em"/></mtd></mtr><mtr><mtd columnalign="right" class="align-odd"></mtd>                            <mtd class="align-even"> <mo class="MathClass-rel">=</mo> <msub><mrow ><mi >R</mi></mrow><mrow ><mi >F</mi> </mrow></msub > <mfenced separators="" open="("  close=")" ><mrow><mfrac><mrow ><mi >x</mi> <mo class="MathClass-bin">+</mo> <mi >&#x03BB;</mi></mrow>  <mrow ><mn>4</mn></mrow></mfrac>   <mo class="MathClass-punc">,</mo> <mfrac><mrow ><mi >y</mi> <mo class="MathClass-bin">+</mo> <mi >&#x03BB;</mi></mrow>   <mrow ><mn>4</mn></mrow></mfrac>   <mo class="MathClass-punc">,</mo> <mfrac><mrow ><mi >z</mi> <mo class="MathClass-bin">+</mo> <mi >&#x03BB;</mi></mrow>   <mrow ><mn>4</mn></mrow></mfrac>   </mrow></mfenced><mspace width="2em"/></mtd>                  <mtd columnalign="right" class="align-label"></mtd>                 <mtd class="align-label">                 <mspace width="2em"/></mtd></mtr><mtr><mtd columnalign="right" class="align-odd"><mi >&#x03BB;</mi></mtd>                           <mtd class="align-even"> <mo class="MathClass-rel">=</mo> <msqrt><mrow><mi >x</mi><mi >y</mi></mrow></msqrt> <mo class="MathClass-bin">+</mo> <msqrt><mrow><mi >y</mi><mi >z</mi></mrow></msqrt> <mo class="MathClass-bin">+</mo> <msqrt><mrow><mi >z</mi><mi >x</mi></mrow></msqrt><mspace width="2em"/></mtd>                       <mtd columnalign="right" class="align-label"></mtd>                 <mtd class="align-label">   <mspace width="2em"/></mtd></mtr></mtable></math>