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If 2alpha= -1-isqrt(3)" and"2beta= -1+is...

If `2alpha= -1-isqrt(3)" and"2beta= -1+isqrt(3)`, then `5alpha^(4)+5beta^(4)+7alpha^(-1)beta^(-1)` is equal to

A

`-1`

B

`-2`

C

`0`

D

`2`

Text Solution

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The correct Answer is:
D
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