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D( x )
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
16/(2*x^2) = 0
8*x^-2 = 0 // : 8
x^-2 = 0
x należy do O
x belongs to the empty set
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