El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(\left|{x}\right| \right)} + \cos{\left(\left|{x}\right| \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = -52.621676947629$$
$$x_{2} = -33.7721210260903$$
$$x_{3} = -112.311937365835$$
$$x_{4} = 93.4623814442964$$
$$x_{5} = 21.2057504117311$$
$$x_{6} = 43.1968989868597$$
$$x_{7} = -55.7632696012188$$
$$x_{8} = 90.3207887907066$$
$$x_{9} = -96.6039740978861$$
$$x_{10} = 71.4712328691678$$
$$x_{11} = 11.7809724509617$$
$$x_{12} = 162.577419823272$$
$$x_{13} = 8.63937979737193$$
$$x_{14} = 18.0641577581413$$
$$x_{15} = 27.4889357189107$$
$$x_{16} = -71.4712328691678$$
$$x_{17} = 74.6128255227576$$
$$x_{18} = 22433.3277411213$$
$$x_{19} = 40.0553063332699$$
$$x_{20} = 33.7721210260903$$
$$x_{21} = 84.037603483527$$
$$x_{22} = -8.63937979737193$$
$$x_{23} = -99.7455667514759$$
$$x_{24} = -58.9048622548086$$
$$x_{25} = -18.0641577581413$$
$$x_{26} = 30.6305283725005$$
$$x_{27} = 96.6039740978861$$
$$x_{28} = -14.9225651045515$$
$$x_{29} = -77.7544181763474$$
$$x_{30} = 2.35619449019234$$
$$x_{31} = -36.9137136796801$$
$$x_{32} = 68.329640215578$$
$$x_{33} = 65.1880475619882$$
$$x_{34} = -62.0464549083984$$
$$x_{35} = 80.8960108299372$$
$$x_{36} = -21.2057504117311$$
$$x_{37} = -2.35619449019234$$
$$x_{38} = -11.7809724509617$$
$$x_{39} = -68.329640215578$$
$$x_{40} = -24.3473430653209$$
$$x_{41} = -90.3207887907066$$
$$x_{42} = 36.9137136796801$$
$$x_{43} = -46.3384916404494$$
$$x_{44} = -74.6128255227576$$
$$x_{45} = 351.072979038659$$
$$x_{46} = 49.4800842940392$$
$$x_{47} = 62.0464549083984$$
$$x_{48} = -27.4889357189107$$
$$x_{49} = 46.3384916404494$$
$$x_{50} = -30.6305283725005$$
$$x_{51} = 87.1791961371168$$
$$x_{52} = 52.621676947629$$
$$x_{53} = 24.3473430653209$$
$$x_{54} = -84.037603483527$$
$$x_{55} = -49.4800842940392$$
$$x_{56} = 5.49778714378214$$
$$x_{57} = -40.0553063332699$$
$$x_{58} = -65.1880475619882$$
$$x_{59} = -5.49778714378214$$
$$x_{60} = -43.1968989868597$$
$$x_{61} = 99.7455667514759$$
$$x_{62} = 58.9048622548086$$
$$x_{63} = 14.9225651045515$$
$$x_{64} = -80.8960108299372$$
$$x_{65} = 55.7632696012188$$
$$x_{66} = -93.4623814442964$$
$$x_{67} = -228.550865548657$$
$$x_{68} = 77.7544181763474$$
$$x_{69} = -87.1791961371168$$