<math display='block'> <mmlrow> <mmli>M</mi><mmlo>=</mo><mmli>&#x03C1;</mi><mmli>w</mi><mmli>d</mi><mmlo stretchy='false'>(</mo><mmlsub> <mmli>l</mi> <mmlrow> <mmli>A</mi><mmli>D</mi> </mrow> </msub> <mmlo>+</mo><mmlsub> <mmli>l</mi> <mmlrow> <mmli>B</mi><mmli>C</mi> </mrow> </msub> <mmlo stretchy='false'>)</mo><mmli>sin</mi><mmli>&#x03B8;</mi><mmlo>/</mo><mmln>2</mn> </mrow> </math>