UPSC NDA II 2023 Mathematics Solved Paper

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Consider the following for the next two (02) items that follow :
Let p=cos(‌
Ï€
5
)
‌cos
(‌
2Ï€
5
)
and q=cos(‌
4Ï€
5
)
‌cos
(‌
8Ï€
5
)
.
[NDA II 2023]
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Question : 74 of 120
 
Marks: +1, -0
What is the value of pq?
[NDA II 2023]
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