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D( x )
e^(x^2) = 0
e^(x^2) = 0
e^(x^2) = 0
x należy do O
x in (-oo:+oo)
4/(e^(x^2)) = 0
4/(e^(x^2)) = 0 // * e^(x^2)
4 = 0
x belongs to the empty set
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