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D( x )
4^(x^2) = 0
4^(x^2) = 0
4^(x^2) = 0
x naleu017Cy do O
x in (-oo:+oo)
1/(4^(x^2)) = 0
1/(4^(x^2)) = 0 // * 4^(x^2)
1 = 0
x belongs to the empty set
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