Dando : ln(x) = 1/x; La regla de la cadena; x = 1. Resuelva:
(1) ln(ex) = x = 1
ln(ex) = ln(u) ex (Fije u=ex)
= 1/u ex = 1/ex ex = 1 (ecuación 1)
ex = ex   Q.E.D.
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