(1) (5 points) Find the domain of the vector-valued function r(t) = vt + 5i j + 3tk. (2) Let r(t) = sin 3ti + cos 3tj + 2tk. Find (a) (5 points) r'(t), (b) (5 points) r"(t), (c) (5 points) r (t) . r"(t). (d) (5 points) r'(t) x r" (t)