f ' (x) = e^{f(x)}..........................(1)
ln f '(x) = f(x).............................(2)
f '' / f ' = f '................................(3)
f '' = (f ')²..................................(4)
f ''' = 2f ' f ''...............................(5)
d³f(x)/dx³ = 2 e^{f(x)} e^{2f(x)}
f ''' = d³f(x)/dx³ = 2 e^{3f(x)}.......(6)
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