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Evaluate the line integral Q F . dr by evaluating the surface integral in Stokes' Theorem with an appropriate choice of C S. Assume that C has a counterclockwise orientation when viewed from above. F- (6xy sin z,3x sin z,3x y cos z) C is the boundary of the plane z = 6 - 2x - 3y in the first octant. Rewrite the given line integral as a surface integral. OF - dr -D S Evaluate the integral. OF . dr= (Type an exact answer.) C