Write in set builder form{1,-1,i,-i}

1.	Write in set builder form{1,-1,i,-i}
Answer» Set builder form of {1,-1,i,-i} isA={x: x is the solution of eqaution (x2\xa0-1)(x2\xa0+1)=0} ={x: x is the solution of equation x4\xa0- 1=0} [by using identity (a-b)(a+b)=a2\xa0- b2]

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