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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (12*e^1)/(x^2) // - (12*e^1)/(x^2)
y-((12*e^1)/(x^2)) = 0
y-12*e*x^-2 = 0
-12*e*x^-2 = -y // : -12*e
x^-2 = (1/12)*e^-1*y
-2 < 0
1/(x^2) = (1/12)*e^-1*y // * x^2
1 = (1/12)*e^-1*x^2*y // : (1/12)*e^-1*y
12*e*y^-1 = x^2
x^2 = 12*e*y^-1 // ^ 1/2
abs(x) = 2*3^(1/2)*e^(1/2)*y^(-1/2)
x = 2*3^(1/2)*e^(1/2)*y^(-1/2) or x = -(2*3^(1/2)*e^(1/2)*y^(-1/2))
x in { 2*3^(1/2)*e^(1/2)*y^(-1/2), -(2*3^(1/2)*e^(1/2)*y^(-1/2)) }
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