?????? ??????? ????? ???? ?????? f(x) = x(1 + e^{-2x})? ??? ??? ??????? ?? ??????? ??? ???? ????? ??????? ??? ?????????. ??? ???? ??????? ?????? ?? ?????? ?? ?????????? ??????? ???????? ???????. ?? ???????? ??? ????? ??? ????? ?????? ??? ???????? ??????.