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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((e^1)/x)*(x-1))/x = 0
((e/x)*(x-1))/x = 0
(e*x^-1*(x-1))/x = 0
( e*x^-1 )
e*x^-1 = 0 // : e
x^-1 = 0
x należy do O
( x-1 )
x-1 = 0 // + 1
x = 1
x = 1
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