Question 1 ). Use the method described in the video lecture to find a Vector equation . for the line segment. that joins P. ( - 1 , 2 , - 2 ) to P (zz , 0 , 5 ) 2 ). Show that the curve rit) = (tcost, taint, t) lies. on the cone. Z= xzxyz and use this fact to help. sketch. the curve. 3 ) . At what points does the helix rit )=