A point moves along a cirde with position vector given by r(t) = {cos :2 , sin ti}. a) EXpress a(t) as a combination of r03) and v01\"), for t v: D. In] Compute the unit tangent vector T8) and unit normal vector N(t) for t :2 o. c) Find the tangential and normal components of the acceleration vector 3(a)