Consider the curve C = C₁ U C2 U C3 U C4, piecewise smooth, oriented from the point A (3, 7, 3) to point B(4, 1, 1), which is shown in the following figure: 21 A(3, 7,3) B(4,1,1) y=2r+1 Y F-dr F. dr is: X If F = (2xy - 3z, 1 + x², −3x) then the value of A) 52 B) -52 C) 38 D) -38

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