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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)
5*(360/(x^2))*x = 0
1800*x^-1 = 0 // : 1800
x^-1 = 0
x należy do O
x belongs to the empty set
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