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

If `A={x in C:x^2=1}`and `B={x in C:x^4=1}`,then `AcupB`is :

A

a){-1,i}

B

b){-1,1}

C

c)`{+-1,+-1i}`

D

d)`phi`

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