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If x^4-1=0 then x=...

If `x^4-1=0` then x=

A

`(1pm i)/(sqrt2),(-1 pm i)/(sqrt2)`

B

`(1pm i)/(2),(-1 pm i)/(sqrt2)`

C

`(1pm i)/(sqrt2),(-1 pm i)/(2)`

D

`pm 1, pm i`

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The correct Answer is:
A
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