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i in (-oo:+oo)
4-(((8*i)/4)*i) = 0
4-2*i^2 = 0
-2*i^2 = -4 // : -2
i^2 = 2
i^2 = 2 // ^ 1/2
abs(i) = 2^(1/2)
i = 2^(1/2) or i = -2^(1/2)
i in { 2^(1/2), -2^(1/2) }
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