$$\lim_{n \to \infty}\left(\frac{\operatorname{acos}{\left(\frac{1}{n^{2} + 4} \right)}}{\operatorname{acos}{\left(\frac{1}{\left(n + 1\right)^{2} + 4} \right)}}\right) = 1$$
$$\lim_{n \to 0^-}\left(\frac{\operatorname{acos}{\left(\frac{1}{n^{2} + 4} \right)}}{\operatorname{acos}{\left(\frac{1}{\left(n + 1\right)^{2} + 4} \right)}}\right) = - \frac{- \pi - 2 i \log{\left(\sqrt{15} + i \right)} + 4 i \log{\left(2 \right)}}{\pi - 2 i \log{\left(5 \right)} + 2 i \log{\left(2 \sqrt{6} + i \right)}}$$
Más detalles con n→0 a la izquierda$$\lim_{n \to 0^+}\left(\frac{\operatorname{acos}{\left(\frac{1}{n^{2} + 4} \right)}}{\operatorname{acos}{\left(\frac{1}{\left(n + 1\right)^{2} + 4} \right)}}\right) = - \frac{- \pi - 2 i \log{\left(\sqrt{15} + i \right)} + 4 i \log{\left(2 \right)}}{\pi - 2 i \log{\left(5 \right)} + 2 i \log{\left(2 \sqrt{6} + i \right)}}$$
Más detalles con n→0 a la derecha$$\lim_{n \to 1^-}\left(\frac{\operatorname{acos}{\left(\frac{1}{n^{2} + 4} \right)}}{\operatorname{acos}{\left(\frac{1}{\left(n + 1\right)^{2} + 4} \right)}}\right) = - \frac{\pi - 2 i \log{\left(5 \right)} + 2 i \log{\left(2 \sqrt{6} + i \right)}}{- \pi - 2 i \log{\left(3 \sqrt{7} + i \right)} + 6 i \log{\left(2 \right)}}$$
Más detalles con n→1 a la izquierda$$\lim_{n \to 1^+}\left(\frac{\operatorname{acos}{\left(\frac{1}{n^{2} + 4} \right)}}{\operatorname{acos}{\left(\frac{1}{\left(n + 1\right)^{2} + 4} \right)}}\right) = - \frac{\pi - 2 i \log{\left(5 \right)} + 2 i \log{\left(2 \sqrt{6} + i \right)}}{- \pi - 2 i \log{\left(3 \sqrt{7} + i \right)} + 6 i \log{\left(2 \right)}}$$
Más detalles con n→1 a la derecha$$\lim_{n \to -\infty}\left(\frac{\operatorname{acos}{\left(\frac{1}{n^{2} + 4} \right)}}{\operatorname{acos}{\left(\frac{1}{\left(n + 1\right)^{2} + 4} \right)}}\right) = 1$$
Más detalles con n→-oo