We are asked to evaluate the surface integral of a vector field \( \mathbf{F} = f(xi + yj + zk) \) over the surface \( S \) of a cube bounded by the planes \( x = 0, x = a, y = 0, y = a, z = 0, \) and \( z = 2 \). We are instructed to use Gauss' theorem (also
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