KEAM 2023 Math Solved Paper

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Question : 18 of 120

Marks: +1, -0

Let x+‌

1

x

=2‌cos‌α. For any n∈ℕ, the value of xn−‌

1

xn

is

cos(nα)
2‌cos(nα)
2i‌sin‌(nα)
i‌sin‌(nα)
4‌cos(nα)

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