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D( x )
15*e^(15*e^3*x) = 0
15*e^(15*e^3*x) = 0
15*e^(15*e^3*x) = 0
e^(15*e^3*x) = 0
x należy do O
15*e^(15*e^3*x) = 0 <=> 15 = 0 or 15*e^(15*e^3*x) = 0 <=> e^(15*e^3*x) = 0
x in (-oo:+oo)
1/(15*e^(15*e^3*x)) = 0
1/(15*e^(15*e^3*x)) = 0 // * 15*e^(15*e^3*x)
1 = 0
x belongs to the empty set
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