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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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LN(x)
LN devolve o logaritmo natural de @x. Se @x <= 0, LN devolve o erro #NUM!.
Esta função é compatível com o Excel.
LN(7) igual a 1.94591.
EXP, LOG2, LOG10.
