also sei F(x)= y dann
y = f(x)g(x)
ln(y) = g(x) * ln ( f(x) )
y = e g(x) * ln ( f(x) ) = F(x)
Produkt - und Kettenregel:
also F ' (x) = e g(x) * ln ( f(x) ) * ( g ' (x) * ln ( f(x) ) + g (x) * 1/f(x) * f ' (x)
= f(x)g(x) * ( g ' (x) * ln ( f(x) ) + g (x) * f ' (x) / /f(x) )