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If A ={x:x^2 = 1} and B={x:x^4 =1}, then...

If `A ={x:x^2 = 1}` and `B={x:x^4 =1}`, then `ADeltaB` is equal to

A

{i,-i}

B

{-1,1}

C

{-1,1,i,-i}

D

None of these

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