Answer
$$
\lim _{x \rightarrow \infty} e^{x-x^2}=0.
$$
Work Step by Step
Since $ x^2-x $ is always positive for all $ x>0$, then we have
$$
\lim _{x \rightarrow \infty} e^{x-x^2}=\lim _{x \rightarrow \infty} e^{-(x^2-x)}=0.
$$
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