Next Page Page 23 of 31 Question 23 (6 points) Listen Let T' (t ) = sin (3t) 7 - cos(3t) 3 - V7(+ + 1) 7. and let P be the point on the curve where t 12 . (a) (3 points) Find the unit tangent vector to this curve at P. (b) (3 points) Find the "principal" unit normal vector to this curve at P. (Directly write down final answer. No need to show detailed process.) Paragraph B I U A EV +