El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\operatorname{atan}{\left(\tan{\left(\frac{x}{2} \right)} + 1 \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\pi}{2}$$
Solución numérica$$x_{1} = 73.8274273593601$$
$$x_{2} = 105.243353895258$$
$$x_{3} = -26.7035375555132$$
$$x_{4} = -64.4026493985908$$
$$x_{5} = 61.261056745001$$
$$x_{6} = 42.4115008234622$$
$$x_{7} = -83.2522053201295$$
$$x_{8} = 17.2787595947439$$
$$x_{9} = 86.3937979737193$$
$$x_{10} = -1.5707963267949$$
$$x_{11} = -20.4203522483337$$
$$x_{12} = 92.6769832808989$$
$$x_{13} = 36.1283155162826$$
$$x_{14} = -32.9867228626928$$
$$x_{15} = -39.2699081698724$$
$$x_{16} = -58.1194640914112$$
$$x_{17} = 306.305283725005$$
$$x_{18} = 4.71238898038469$$
$$x_{19} = -76.9690200129499$$
$$x_{20} = -95.8185759344887$$
$$x_{21} = 48.6946861306418$$
$$x_{22} = -51.8362787842316$$
$$x_{23} = 23.5619449019235$$
$$x_{24} = 67.5442420521806$$
$$x_{25} = -14.1371669411541$$
$$x_{26} = 98.9601685880785$$
$$x_{27} = 80.1106126665397$$
$$x_{28} = -7.85398163397448$$
$$x_{29} = 312.588469032184$$
$$x_{30} = -45.553093477052$$
$$x_{31} = 54.9778714378214$$
$$x_{32} = -89.5353906273091$$
$$x_{33} = 10.9955742875643$$
$$x_{34} = -70.6858347057703$$
$$x_{35} = 29.845130209103$$
$$x_{36} = -102.101761241668$$