waecE-LEARNING
Further Mathematics Paper 2, Nov/Dec. 2014  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength








Question 7

If the position vectors of A and B relative to the origin are   and , find the angle between  and .

 

 

 

 

 

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Observation

The Chief Examiner reported that majority of the candidates attempted this question and their performance was described as fair. Majority of them were reported not to have applied the dot product correctly.  Candidates were expected to show that if  =  and  = , then êê =  =  5 and êê =  =  . Furthermore, ٠ = ٠ =  20 -  6 = 14. If θ was the angle between  and , then cos θ =  = . Therefore, θ = cos-1() = 58.67o.

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