UPSC NDA II 2024 Mathematics Paper

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Question : 53 of 120

Marks: +1, -0

Let θ be the angle between two unit vectors

→

a

and

→

b

. if

→

a

+2

→

b

is perpendicular to 5

→

a

−4

→

b

then what is cos‌θ+cos‌2‌θ equal to?

0
1/2
1
‌
√3‌+‌1
2

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