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4
D f = Il faut que x − 2 > 0 x > 2
Donc D f =]2 ;+∞[
Fonction Exponentielle :
1. F(x)= e x ; D f = R
Propriétés
e x > 0
e 0 = 1
e 1 = e
e ln (a) = a ; ln(e a ) = a
e a+b = e a . e b
e a−b = ea
e b
e −1 = 1 e
(e a ) n = e a∗n
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