Step 5 of B - Calculate the unit normal vector N {m} by using the considerations that the tangent vector 1"r {at} = {1, cos 1:}; so the vector { cos 2:, 1} is orthogonal to the vector I"r {2:}. - The unit normal 1vector N [33) is one of the unit vectors in the direction of either { cos 3;, 1} or ( cos at, 1}. 1r - The graph of y [m] = sin a: shows that the unit normal vector points at a: = E in the negative y direction. _ (cos 3:, 1} Mm} IIicosm.1> || {cosm, 1} rcos2m+ (1}2 NCT) (cos ,1> \"cosg + l[1}2 [Dr _1)