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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)
160/(x^2) = 0
160*x^-2 = 0 // : 160
x^-2 = 0
x należy do O
x belongs to the empty set
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