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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y+1 = (11/12)*y // - (11/12)*y
4/y-((11/12)*y)+1 = 0
(-11/12)*y+4/y+1 = 0
4*y^-1-11/12*y^1+1*y^0 = 0
(1*y^1-11/12*y^2+4*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^1-11/12*y^2+4*y^0) = 0
y^1
(-11/12)*y^2+y+4 = 0
(-11/12)*y^2+y+4 = 0
DELTA = 1^2-(4*4*(-11/12))
DELTA = 47/3
DELTA > 0
y = ((47/3)^(1/2)-1)/(2*(-11/12)) or y = (-(47/3)^(1/2)-1)/(2*(-11/12))
y = -6/11*((47/3)^(1/2)-1) or y = 6/11*((47/3)^(1/2)+1)
y in { -6/11*((47/3)^(1/2)-1), 6/11*((47/3)^(1/2)+1)}
y in { -6/11*((47/3)^(1/2)-1), 6/11*((47/3)^(1/2)+1) }
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