Question: If a is a constant vector, r = x i + y j + z k, and S is an oriented, smooth surface with a

If a is a constant vector, r = x i + y j + z k, and S is an oriented, smooth surface with a simple, closed, smooth, positively oriented boundary curve C, show that 2a 2a · dS = (a X r) · dr

2a 2a dS = (a X r) dr

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