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Evaluate the surface integral S F · dS for the given vector field F and the...

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = yi − xj + 4zk, S is the hemisphere x^2 + y2^ + z^2 = 4, z ≥ 0, oriented downward

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