x=3cos t, y=3sin t, z=4t curve at the point where .   . Ans. (a) Tangent: (b) Normal: .   4  r tiˆ ˆj  5 (c) Bi-normal:    4  r t ˆj 54 42
curve x=3cos t, y=3sin t, z=4t at the point where  . Ans. (a) Tangent:  . (b) Normal: r   4 ˆj  tiˆ . (c) Bi-normal: r   4 ˆj  t  54 5  42