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UPSC NDA 2 2022 Mathematics Solved Paper
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© examsnet.com
Question : 47
Total: 120
What is the value of
cos
(
5
π
17
)
+
cos
(
7
π
17
)
+
2
cos
(
11
π
17
)
cos
(
π
17
)
?
[NDA II 2022]
0
1
4
cos
(
6
π
17
)
cos
(
π
17
)
4
cos
(
11
π
17
)
cos
(
π
17
)
Validate
Solution:
👈: Video Solution
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