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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(e^2*x-1)/x = 2.2 // - 2.2
(e^2*x-1)/x-2.2 = 0
(e^2*x-1)/x+(-2.2*x)/x = 0
e^2*x-2.2*x-1 = 0
(e^2-2.2)*x-1 = 0
((e^2-2.2)*x-1)/x = 0
((e^2-2.2)*x-1)/x = 0 // * x
(e^2-2.2)*x-1 = 0
(e^2-2.2)*x-1 = 0 // + 1
(e^2-2.2)*x = 1 // : e^2-2.2
x = 1/(e^2-2.2)
x = 1/(e^2-2.2)
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