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Evaluate the scalar surface integral ∬ S1 (x) dS, where S1 is the portion of the...

Evaluate the scalar surface integral ∬ S1 (x) dS, where S1 is the portion of the helicoid which is the image of the parametrization r( u , v ) =< u cos( v ) , u sin( v ) , v > over 0 ≤ u ≤ 2 and 0 ≤ v ≤ π/2.

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