Example: evaluate || (vxf):n ds where f = yi + (x - 2xz)j - xyk and s is the surface of the sphere x2 + y2 + z2 = a2 above the xy-plane. zt solution. f = yi + (

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here i used Gauss divergence therorm.. first I take curl of F as A then using divergence therorm, I take divergence of A which is zero..

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