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Use Stokes' theorem to compute the circulation $o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}$vec$(F)*dvec(r)$ where vec$(F)=($:$4xyz,6y^{2}z,5yz$:$)$ and $C$ is the boundary of the portion of the plane $2x+3y+z=6$ in the first octant Here $C$ is positively oriented with respect to the plane whose orientation is upward.