COMEDK Exam 2013 Solved Paper

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Question : 155 of 180

Marks: +1, -0

If x+‌

1

x

=2‌cos‌α, then xn+‌

1

xn

is equal to

2a‌cos‌α
2n‌cos‌n‌α
2issin‌nα
2‌cos‌n‌α

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