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