El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$- \cos{\left(x + 2 \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = -2 + \frac{\pi}{2}$$
$$x_{2} = -2 + \frac{3 \pi}{2}$$
Solución numérica$$x_{1} = 68.6858347057703$$
$$x_{2} = -60.1194640914112$$
$$x_{3} = 43.553093477052$$
$$x_{4} = -91.5353906273091$$
$$x_{5} = 18.4203522483337$$
$$x_{6} = -9.85398163397448$$
$$x_{7} = -53.8362787842316$$
$$x_{8} = -85.2522053201295$$
$$x_{9} = -28.7035375555132$$
$$x_{10} = -82.1106126665397$$
$$x_{11} = -12.9955742875643$$
$$x_{12} = 90.6769832808989$$
$$x_{13} = -19.2787595947439$$
$$x_{14} = -22.4203522483337$$
$$x_{15} = 34.1283155162826$$
$$x_{16} = 96.9601685880785$$
$$x_{17} = -100.960168588078$$
$$x_{18} = 74.9690200129499$$
$$x_{19} = -389.986692718339$$
$$x_{20} = 93.8185759344887$$
$$x_{21} = -25.5619449019235$$
$$x_{22} = 65.5442420521806$$
$$x_{23} = -94.6769832808989$$
$$x_{24} = 81.2522053201295$$
$$x_{25} = -34.9867228626928$$
$$x_{26} = -63.261056745001$$
$$x_{27} = 24.7035375555132$$
$$x_{28} = 21.5619449019235$$
$$x_{29} = 40.4115008234622$$
$$x_{30} = 2.71238898038469$$
$$x_{31} = -41.2699081698724$$
$$x_{32} = -16.1371669411541$$
$$x_{33} = -75.8274273593601$$
$$x_{34} = -2268.65909956504$$
$$x_{35} = -0.429203673205103$$
$$x_{36} = 30.9867228626928$$
$$x_{37} = -3.5707963267949$$
$$x_{38} = -170.075206967054$$
$$x_{39} = 15.2787595947439$$
$$x_{40} = 52.9778714378214$$
$$x_{41} = 71.8274273593601$$
$$x_{42} = 100.101761241668$$
$$x_{43} = -38.1283155162826$$
$$x_{44} = 84.3937979737193$$
$$x_{45} = 37.2699081698724$$
$$x_{46} = -56.9778714378214$$
$$x_{47} = 12.1371669411541$$
$$x_{48} = 78.1106126665397$$
$$x_{49} = 56.1194640914112$$
$$x_{50} = -50.6946861306418$$
$$x_{51} = 59.261056745001$$
$$x_{52} = 8.99557428756428$$
$$x_{53} = 49.8362787842316$$
$$x_{54} = -44.4115008234622$$
$$x_{55} = 46.6946861306418$$
$$x_{56} = -78.9690200129499$$
$$x_{57} = -6.71238898038469$$
$$x_{58} = -72.6858347057703$$
$$x_{59} = 5.85398163397448$$
$$x_{60} = -88.3937979737193$$
$$x_{61} = -47.553093477052$$
$$x_{62} = -66.4026493985908$$
$$x_{63} = -97.8185759344887$$
$$x_{64} = 87.5353906273091$$
$$x_{65} = 62.4026493985908$$
$$x_{66} = -69.5442420521806$$
$$x_{67} = 27.845130209103$$
$$x_{68} = -31.845130209103$$