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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(6*y)/11 = 12/y // - 12/y
(6*y)/11-(12/y) = 0
(6*y)/11-12*y^-1 = 0
6/11*y^1-12*y^-1 = 0
(6/11*y^2-12*y^0)/(y^1) = 0 // * y^2
y^1*(6/11*y^2-12*y^0) = 0
y^1
(6/11)*y^2-12 = 0
(6/11)*y^2-12 = 0
DELTA = 0^2-(-12*4*(6/11))
DELTA = 288/11
DELTA > 0
y = ((288/11)^(1/2)+0)/(2*(6/11)) or y = (0-(288/11)^(1/2))/(2*(6/11))
y = 11/12*(288/11)^(1/2) or y = 11/12*(288/11)^(1/2)
y in { 11/12*(288/11)^(1/2), 11/12*(288/11)^(1/2)}
y in { 11/12*(288/11)^(1/2), 11/12*(288/11)^(1/2) }
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