What is \cos (\frac{\\theta}{2}) equal to?

{|a^{\^}-\stackrel{\^}{b}|}/{2}

{|a^{\^}+\stackrel{\^}{b}|}/{2}

{|a^{\^}-\stackrel{\^}{b}|}/{4}

{|a^{\^}+\stackrel{\^}{b}|}/{4}

UPSC NDA Math Model Paper 9

Comprehension:(Que No. 60 - 61)
Direction: For the next two (2) items that follow:
Let

be two unit vectors and θ be the angle between them

Question : 61 of 120

Marks: +1, -0

What is cos(

) equal to?

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