WBJEE 2017 Math Solved Paper

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Question : 62 of 75

Marks: +1, -0

Let α and β be the roots of x2+x+1=0. If n be positive integer, then αn+βn is

2‌cos‌
2nπ
3
2‌sin‌
2nπ
3
2‌cos‌
nπ
3
2‌sin‌
nπ
3

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