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Skills Find parametric equations for each of the vector-valued func- tions in Exercises 26-34, and sketch the graphs of the func- tions, indicating the direction for increasing values of t. 26. r(t) = (sin 3t, cos 3t) for t e [0, 2x ] 27. r(1) = (2 - sint, 4 + cost) forte [0, 2x ] 20. r(t) = (sin t, cos 21) for te [0, 2x ] 29. r(t) = (1 + sin t, 3 - cos 2t) for t e [0, 2x ] 30. r(t) = (3 + ni + (3 - =) j fort = 0 31. r(1) = (t, +2, +3) for t E [0, 2] 32. r(1) = (cost, 4 sin t, t) for t e [0, 27 ] 33. r(t) = (cost, sin 21) for fe [0, 2x ] 34. r(1) = (t sint, t cost, () for te [0, 4x ] Evaluate and simplify the indicated quantities in Exer- cises 35-41. 35. (1, 31, 13) + (1, 12,13 ) 36. (1, 1. 13) - (1, 12, 13 ) 37. 5 (cost, sint) 38. / (sin t, cost) 39. (sint, cost) . (cost, - sint) 40. ((sin D) i + (cost) j + (k) x ((cost)i + (sint) j)