[tex]\oint {d{\bf{R}} \times {\bf{A}}} = \mathop{{\int\!\!\!\!\!\int}\mkern-21mu \bigcirc}(adsbygoogle = window.adsbygoogle || []).push({});

{\left( {d{\bf{S}} \times \nabla } \right) \times {\bf{A}}} [/tex]

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# How do you prove this?

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