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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3*y-(6/y)-2 = 3 // - 3
3*y-(6/y)-3-2 = 0
3*y-6*y^-1-3-2 = 0
3*y^1-6*y^-1-5*y^0 = 0
(3*y^2-5*y^1-6*y^0)/(y^1) = 0 // * y^2
y^1*(3*y^2-5*y^1-6*y^0) = 0
y^1
3*y^2-5*y-6 = 0
3*y^2-5*y-6 = 0
DELTA = (-5)^2-(-6*3*4)
DELTA = 97
DELTA > 0
y = (97^(1/2)+5)/(2*3) or y = (5-97^(1/2))/(2*3)
y = (97^(1/2)+5)/6 or y = (5-97^(1/2))/6
y in { (5-97^(1/2))/6, (97^(1/2)+5)/6}
y in { (5-97^(1/2))/6, (97^(1/2)+5)/6 }
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