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