UPSC NDA Math Model Paper 5

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Question : 117 of 120

Marks: +1, -0

Find the value of cos2x+cos2(x+

π

6

)+cos2(x−

π

6

).

3−2‌cos‌2‌x
2
3+2‌sin‌2‌x
2
3+2‌cos‌2‌x
2
None of the above

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