NDA Math Vector Algebra

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For the next two (2) items that follow :
Let
∧
a
,
∧
b
be two units vectors and θ be the angle θ between them.
[NDA I 2016]
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Question : 71 of 101
 
Marks: +1, -0
What is sin(
θ
2
)
eqaul to ?
[NDA I 2016]
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