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