$$\lim_{x \to \infty}\left(e^{- x} \tan{\left(x \right)}\right) = 0$$ $$\lim_{x \to 0^-}\left(e^{- x} \tan{\left(x \right)}\right) = 0$$ More at x→0 from the left $$\lim_{x \to 0^+}\left(e^{- x} \tan{\left(x \right)}\right) = 0$$ More at x→0 from the right $$\lim_{x \to 1^-}\left(e^{- x} \tan{\left(x \right)}\right) = \frac{\tan{\left(1 \right)}}{e}$$ More at x→1 from the left $$\lim_{x \to 1^+}\left(e^{- x} \tan{\left(x \right)}\right) = \frac{\tan{\left(1 \right)}}{e}$$ More at x→1 from the right $$\lim_{x \to -\infty}\left(e^{- x} \tan{\left(x \right)}\right)$$ More at x→-oo