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((b*w)^2/((k-w^2)^2+(b*w)^2) - 1/2)^2 + ((b*w)(k-w^2)/((k-w^2)^2+(b*w)^2) )^2
((b*w)^2/((k-w^2)^2+(b*w)^2) - 1/2)^2 + ((b*w)(k-w^2)/((k-w^2)^2+(b*w)^2) )^2
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