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W in (-oo:+oo)
W^2 = (2/34)/81 // - (2/34)/81
W^2-((2/34)/81) = 0
W^2-1/1377 = 0
1*W^2 = 1/1377 // : 1
W^2 = 1/1377
W^2 = 1/1377 // ^ 1/2
abs(W) = (1/1377)^(1/2)
W = (1/1377)^(1/2) or W = -(1/1377)^(1/2)
W in { (1/1377)^(1/2), -(1/1377)^(1/2) }
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