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D( x )
5*x^(10^9) = 0
5*x^(10^9) = 0
5*x^(10^9) = 0
5*x^1000000000 = 0 // : 5
x^1000000000 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(5*x^(10^9)) = 0
1/5*x^-1000000000 = 0 // : 1/5
x^-1000000000 = 0
x należy do O
x belongs to the empty set
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