Problem 8. Sketch each parametrized curve r(t) on an interval including the point P. Sketch T and N at P. (A rough sketch is fine - in fact, you are not required to actually compute T or N.) a. r(t) = (cost, sin t), P = = (1, 0). b. r(t)=(t, et), P = (1,0). c. r(t) = (cost, sint, t), P = (-1, 0, π). d. r(t) = (sint, cost, t), P = (0, −1/π,π).