Manipal Entrance Test 2013 Math Paper

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Question : 23 of 80

Marks: +1, -0

If θ be the angle between the unit vectors a and b, then cos

θ

2

is equal to

1
2
|a−b|
1
2
|a+b|
|a−b|
|a+b|
|a+b|
|a−b|

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