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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)
c = 2/(x^2) // - 2/(x^2)
c-(2/(x^2)) = 0
c-2*x^-2 = 0
-2*x^-2 = -c // : -2
x^-2 = c/2
-2 < 0
1/(x^2) = c/2 // * x^2
1 = (c/2)*x^2 // : c/2
2*c^-1 = x^2
x^2 = 2*c^-1 // ^ 1/2
abs(x) = 2^(1/2)*c^(-1/2)
x = 2^(1/2)*c^(-1/2) or x = -(2^(1/2)*c^(-1/2))
x in { 2^(1/2)*c^(-1/2), -(2^(1/2)*c^(-1/2)) }
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