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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(11/12)*x = 11/x // - 11/x
(11/12)*x-(11/x) = 0
(11/12)*x-11*x^-1 = 0
11/12*x^1-11*x^-1 = 0
(11/12*x^2-11*x^0)/(x^1) = 0 // * x^2
x^1*(11/12*x^2-11*x^0) = 0
x^1
(11/12)*x^2-11 = 0
(11/12)*x^2-11 = 0
DELTA = 0^2-(-11*4*(11/12))
DELTA = 121/3
DELTA > 0
x = ((121/3)^(1/2)+0)/(2*(11/12)) or x = (0-(121/3)^(1/2))/(2*(11/12))
x = 6/11*(121/3)^(1/2) or x = 6/11*(121/3)^(1/2)
x in { 6/11*(121/3)^(1/2), 6/11*(121/3)^(1/2)}
x in { 6/11*(121/3)^(1/2), 6/11*(121/3)^(1/2) }
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