UPSC NDA II 2023 Mathematics Solved Paper

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Question : 30 of 120
 
Marks: +1, -0
If tan‌α=‌
1
7
,sin‌β=‌
1
√10
;0<α,β<‌
Ï€
2
, then what is the value of cos(α+2β) ?
[NDA II 2023]
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