In problems 3-5 evaluate S. F · dš using Stokes' theorem. In each case c is oriented counterclockwise when viewed from above. 4. F(x,y,z) = (z)ï + (x²)j+ (y – sin(z))k; c is the boundary of the helicoid given by ¤(r, 0) =< rcos(0),rsin(0),0 >; 0

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