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