CGPET 2012 Solved Paper

Section: Mathematics

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Question : 108 of 150

Marks: +1, -0

If n is positive integer, then (1+i)n+(1−i)n is equal to

(√2)n−2‌cos‌
nπ
4
(√2)n−2sin‌‌
nπ
4
(√2)n+2‌cos‌
nπ
4
(√2)n+2sin‌‌
nπ
4

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