Evaluate the surface integral / 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) = -xi – yj + z°k, s is the part of the cone z = Vx² + v2 between the planes z = 1 and z = 6 with downward orientation

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