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UPSC NDA Math Model Paper 9

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

^

a

,

^

b

be two unit vectors and θ be the angle between them

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Question : 61

Total: 120

What is cos(

) equal to?

|
^
a
−
^
b
|
2
|
^
a
+
^
b
|
2
|
^
a
−
^
b
|
4
|
^
a
+
^
b
|
4

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