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D( x )
e^4*x = 0
e^4*x = 0
e^4*x = 0
e^4*x = 0 // : e^4
x = 0
x in (-oo:0) U (0:+oo)
(4*e^x)/(e^4*x) = 0
(4*e^x)/(e^4*x) = 0 // * e^4*x
4*e^x = 0
e^x = 0
x naleu017Cy do O
4*e^x = 0 <=> 4 = 0 or 4*e^x = 0 <=> e^x = 0
x belongs to the empty set
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