Page Part 3:Thinking [13 marks] 20. Given a = [6, 5, 1], E = {3, 5, 1] and a = [8, 5,2], find a) B - E [2 marks] bl (1' X E [2 marks] c) 9, the angle between ('1' and E [3 marks] d] pro-jag [3 marks] e] Are the vectors (if). and E coplanar? Show your answer algebraically. [3 marks]