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###### Iet 0lt) =cost,1 sint,cst) Then the normal vector of & i8 equal t2) N() =cos t, Sin &; COSb) Nt) =cos t , sin ( costcost,sin/ ,costAnswer &0Answer b)@'NQ) =

Iet 0lt) = cost,1 sint, cst) Then the normal vector of & i8 equal t 2) N() = cos t, Sin &; COS b) Nt) = cos t , sin ( cost cost,sin/ , cost Answer &0 Answer b)@' NQ) =

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