Example 3 Let C be the closed curve consisting of the upper half-circle of radius 1 and the line forming its diameter along the x-axis, oriented counterclockwise. (See Figure 18.25.) Find fF dr where F (x, y) = -yi + aj. %3D 1 C1 C2 -1 1 Figure 18.25: The curve C C1 + C2 for Example 3

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