Valori asintotici dell’arcotangente

\arctan(+\infty) = \dfrac{\pi}{2} \\[10pt] \arctan(-\infty) = -\dfrac{\pi}{2} \\[10pt] \arctan(0) = 0 \\[10pt] \arctan(1) = \dfrac{\pi}{4} \\[10pt] \arctan(-1) = -\dfrac{\pi}{4}