What is \cos 2 \beta+\cos 2 \gamma equal to? [NDA I 2023]

UPSC NDA I 2023 Mathematics Solved Paper

Consider the following for the next two (02) items that follow :
Let a vector

→

−8

make angles α,β,γ with the positive directions of x,y,z axes respectively.

[NDA I 2023]

Question : 68 of 120

Marks: +1, -0

What is cos‌2‌β+cos‌2‌γ equal to?

[NDA I 2023]

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