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1/4(-1 +/- sqrt(1+8 ((y+1)/(y-1))) = -1/4 ± √[1/(y - 1) + 9/16]
1/4(-1 +/- sqrt(1+8 ((y+1)/(y-1))) = -1/4 ± √[1/(y - 1) + 9/16]
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