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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
x = 0.75/(3*x) // - 0.75/(3*x)
x-(0.75/(3*x)) = 0
x-0.25*x^-1 = 0
x-0.25*x^-1 = 0
x^-1*(x^2-0.25) = 0
1*x^2 = 0.25 // : 1
x^2 = 0.25
x^2 = 0.25 // ^ 1/2
abs(x) = 0.25^(1/2)
x = 0.25^(1/2) or x = -0.25^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 0.25^(1/2), -0.25^(1/2) }
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