=lim(-(1+x)^(1/x) · ((x/(1+x)-ln(1+x))/x²)
= -e·lim((x-(1+x)·ln(1+x))/(x²·(1+x))
= -e·lim((x-(1+x)·ln(1+x))/x²)
= -e·lim((1-ln(1+x)-1)/(2x))
= -e·lim((ln(1+x))/(2x))
= -e·lim(x/(2x))
= -e/2
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