User:Dittaeva/Sandbox
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Working
<math>\sum_{m=1}^\infty\sum_{n=1}^\infty\frac{m^2\,n}{3^m\left(m\,3^n+n\,3^m\right)}<math>
Not working, but working at en:watt
<math>\mbox{ W} = \frac{\mbox{J}} {\mbox{s}} = \frac{\mbox{N·m}} {\mbox{s}} = \frac{\mbox{kg·m}^2} {\mbox{s}^3} = \mbox{ V·A}<math>