a 4 Find the curvature of the parametric curve at an arbitrary point. + () = => 0, 5 Find the tangential and normal components of accelerate /> of the parsimetric cave (t) = at t=-1, Bonus Problem: Find on each of the lines x=1+2t x=1 } and y = Ht 2=2t y = 1-t z= t point such that the two points are the closest possible.