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Evaluate the line integral az ds, where C'is the line segment from (0, 6, 1) to (6, 2, 8). Evaluate the line integral 4xy? ds, where C is the right half of the circle x + y = 9. 6. n Compute the total mass of a wire bent in a quarter circle with parametric equations: x=2 cost, y = 2 sint, 0 < t < and density function p(x, y) = x + y.