$$\lim_{x \to \infty} \left|{\operatorname{atan}{\left(n - x \right)} + \frac{\left(-1\right) \pi}{2}}\right| = \pi$$
$$\lim_{x \to 0^-} \left|{\operatorname{atan}{\left(n - x \right)} + \frac{\left(-1\right) \pi}{2}}\right| = \frac{\left(2 \operatorname{atan}{\left(n \right)} - \pi\right) \operatorname{sign}{\left(\operatorname{atan}{\left(n \right)} - \frac{\pi}{2} \right)}}{2}$$
Más detalles con x→0 a la izquierda$$\lim_{x \to 0^+} \left|{\operatorname{atan}{\left(n - x \right)} + \frac{\left(-1\right) \pi}{2}}\right| = \frac{\left(\pi - 2 \operatorname{atan}{\left(n \right)}\right) \operatorname{sign}{\left(- \operatorname{atan}{\left(n \right)} + \frac{\pi}{2} \right)}}{2}$$
Más detalles con x→0 a la derecha$$\lim_{x \to 1^-} \left|{\operatorname{atan}{\left(n - x \right)} + \frac{\left(-1\right) \pi}{2}}\right| = \frac{\left(2 \operatorname{atan}{\left(n - 1 \right)} - \pi\right) \operatorname{sign}{\left(\operatorname{atan}{\left(n - 1 \right)} - \frac{\pi}{2} \right)}}{2}$$
Más detalles con x→1 a la izquierda$$\lim_{x \to 1^+} \left|{\operatorname{atan}{\left(n - x \right)} + \frac{\left(-1\right) \pi}{2}}\right| = \frac{\left(\pi - 2 \operatorname{atan}{\left(n - 1 \right)}\right) \operatorname{sign}{\left(- \operatorname{atan}{\left(n - 1 \right)} + \frac{\pi}{2} \right)}}{2}$$
Más detalles con x→1 a la derecha$$\lim_{x \to -\infty} \left|{\operatorname{atan}{\left(n - x \right)} + \frac{\left(-1\right) \pi}{2}}\right| = 0$$
Más detalles con x→-oo