AMU Engineering 2019 solved paper Solved Paper

Section: Mathematics

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Question : 111 of 150

Marks: +1, -0

If n is a 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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