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i in (-oo:+oo)
1-(((5*i)/5)*i) = 0
1-i^2 = 0
-1*i^2 = -1 // : -1
i^2 = 1
i^2 = 1 // ^ 1/2
abs(i) = 1
i = 1 or i = -1
i in { 1, -1 }
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