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) = yi-xj+z² k S is the helicoid (with upward orientation) with vector equation r(u, v) = u cos vi+usin vj + vk, 0 ≤u≤ 4,0 ≤ v ≤ 4π

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