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D( x )
11*x^2 = 0
11*x^2 = 0
11*x^2 = 0
11*x^2 = 0 // : 11
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(11*x^2) = 0
1/11*x^-2 = 0 // : 1/11
x^-2 = 0
x należy do O
x belongs to the empty set
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