El gráfico de la función cruce el eje X2 con f(x2) = 0
o sea hay que resolver la ecuación:
$$\cos{\left(x_{2} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X2:
Solución analítica$$x_{21} = \frac{\pi}{2}$$
$$x_{22} = \frac{3 \pi}{2}$$
Solución numérica$$x_{21} = 42.4115008234622$$
$$x_{22} = 54.9778714378214$$
$$x_{23} = -86.3937979737193$$
$$x_{24} = -98.9601685880785$$
$$x_{25} = 29.845130209103$$
$$x_{26} = -42.4115008234622$$
$$x_{27} = 89.5353906273091$$
$$x_{28} = -95.8185759344887$$
$$x_{29} = -64.4026493985908$$
$$x_{210} = 14.1371669411541$$
$$x_{211} = -17.2787595947439$$
$$x_{212} = 48.6946861306418$$
$$x_{213} = -48.6946861306418$$
$$x_{214} = -67.5442420521806$$
$$x_{215} = -32.9867228626928$$
$$x_{216} = -80.1106126665397$$
$$x_{217} = 83.2522053201295$$
$$x_{218} = 1.5707963267949$$
$$x_{219} = 10.9955742875643$$
$$x_{220} = -7.85398163397448$$
$$x_{221} = -76.9690200129499$$
$$x_{222} = 98.9601685880785$$
$$x_{223} = -4.71238898038469$$
$$x_{224} = -2266.65909956504$$
$$x_{225} = 36.1283155162826$$
$$x_{226} = 20.4203522483337$$
$$x_{227} = 23.5619449019235$$
$$x_{228} = 51.8362787842316$$
$$x_{229} = -387.986692718339$$
$$x_{230} = -45.553093477052$$
$$x_{231} = 45.553093477052$$
$$x_{232} = -1.5707963267949$$
$$x_{233} = -10.9955742875643$$
$$x_{234} = 26.7035375555132$$
$$x_{235} = 67.5442420521806$$
$$x_{236} = 92.6769832808989$$
$$x_{237} = -58.1194640914112$$
$$x_{238} = 73.8274273593601$$
$$x_{239} = -39.2699081698724$$
$$x_{240} = 95.8185759344887$$
$$x_{241} = -23.5619449019235$$
$$x_{242} = -70.6858347057703$$
$$x_{243} = -168.075206967054$$
$$x_{244} = 80.1106126665397$$
$$x_{245} = 58.1194640914112$$
$$x_{246} = -14.1371669411541$$
$$x_{247} = 32.9867228626928$$
$$x_{248} = -83.2522053201295$$
$$x_{249} = 7.85398163397448$$
$$x_{250} = -89.5353906273091$$
$$x_{251} = -29.845130209103$$
$$x_{252} = 76.9690200129499$$
$$x_{253} = 86.3937979737193$$
$$x_{254} = 70.6858347057703$$
$$x_{255} = -26.7035375555132$$
$$x_{256} = -36.1283155162826$$
$$x_{257} = -92.6769832808989$$
$$x_{258} = -51.8362787842316$$
$$x_{259} = -73.8274273593601$$
$$x_{260} = 17.2787595947439$$
$$x_{261} = 64.4026493985908$$
$$x_{262} = -20.4203522483337$$
$$x_{263} = 4.71238898038469$$
$$x_{264} = -54.9778714378214$$
$$x_{265} = 39.2699081698724$$
$$x_{266} = -61.261056745001$$
$$x_{267} = 61.261056745001$$