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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 1*(6*y-1) // - 1*(6*y-1)
1/y-(1*(6*y-1)) = 0
1/y-(6*y)+1 = 0
1*y^-1-6*y^1+1*y^0 = 0
(1*y^1-6*y^2+1*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^1-6*y^2+1*y^0) = 0
y^1
y-6*y^2+1 = 0
y-6*y^2+1 = 0
DELTA = 1^2-(-6*1*4)
DELTA = 25
DELTA > 0
y = (25^(1/2)-1)/(-6*2) or y = (-25^(1/2)-1)/(-6*2)
y = -1/3 or y = 1/2
y in { -1/3, 1/2}
y in { -1/3, 1/2 }
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