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D( x )
(2*x)^2 = 0
x = 0
(2*x)^2 = 0
(2*x)^2 = 0
4*x^2 = 0 // : 4
x^2 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(14*x^-2)/((2*x)^2) = 0
7/2*x^-4 = 0 // : 7/2
x^-4 = 0
x należy do O
x belongs to the empty set
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