If $\lim_{x\to\infty}\left(f(x)+\int_{0}^xf(t)dt\right)$ exists, what about $\lim_{x\to\infty}f(x)$?
If $\lim\limits_{x\rightarrow\infty} (f'(x)+f(x)) =L<\infty$, does $\lim\limits_{x\rightarrow\infty} f(x) $ exist?