El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\cos^{3}{\left(x^{2} + 5 \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = -52.0663697544252$$
$$x_{2} = 31.997992145891$$
$$x_{3} = -11.7448933029021$$
$$x_{4} = -59.9998131494872$$
$$x_{5} = 88.2480623505825$$
$$x_{6} = -89.7482927969741$$
$$x_{7} = -65.6982548598493$$
$$x_{8} = 6.11649647594639$$
$$x_{9} = -61.6780439570964$$
$$x_{10} = -19.8093768383896$$
$$x_{11} = -29.7597279677183$$
$$x_{12} = 12.2682038262755$$
$$x_{13} = 80.2494693962654$$
$$x_{14} = 72.3870772238288$$
$$x_{15} = 40.3757233452477$$
$$x_{16} = 43.8089664763001$$
$$x_{17} = 82.1835540985957$$
$$x_{18} = 54.252968556004$$
$$x_{19} = -45.8414430083948$$
$$x_{20} = -95.8585985830129$$
$$x_{21} = -67.8854087786538$$
$$x_{22} = 8.29622507408922$$
$$x_{23} = -81.2995901194117$$
$$x_{24} = 92.2512157085239$$
$$x_{25} = 46.2508050170235$$
$$x_{26} = -3.92688677636249$$
$$x_{27} = -35.7538878308534$$
$$x_{28} = 51.5814042397705$$
$$x_{29} = 76.4400077599057$$
$$x_{30} = 48.2455442408022$$
$$x_{31} = -85.1130132549026$$
$$x_{32} = 37.96976947485$$
$$x_{33} = 94.0220938394258$$
$$x_{34} = 25.7407935060421$$
$$x_{35} = -70.0266986896122$$
$$x_{36} = 74.2509759707099$$
$$x_{37} = -39.7483775422106$$
$$x_{38} = 1.68937673339377$$
$$x_{39} = -41.7528002664201$$
$$x_{40} = 2.44858586465837$$
$$x_{41} = 78.2274566213261$$
$$x_{42} = 96.2510729337679$$
$$x_{43} = -5.85405422056964$$
$$x_{44} = 90.202202114565$$
$$x_{45} = 70.250654172218$$
$$x_{46} = 18.2406497744926$$
$$x_{47} = 16.23595127914$$
$$x_{48} = -64.002728249379$$
$$x_{49} = -15.7447846767684$$
$$x_{50} = -43.8806184186827$$
$$x_{51} = -1.68938875055518$$
$$x_{52} = 51.1225730915983$$
$$x_{53} = 86.2496597686963$$
$$x_{54} = -91.9100376890454$$
$$x_{55} = -27.6246171144836$$
$$x_{56} = -73.0136639197297$$
$$x_{57} = 24.4257049227802$$
$$x_{58} = 28.2431759658521$$
$$x_{59} = 30.1269414324541$$
$$x_{60} = 59.9998131496237$$
$$x_{61} = -25.6796956094115$$
$$x_{62} = 57.9217864996593$$
$$x_{63} = -58.0572242345916$$
$$x_{64} = -16.9923184988191$$
$$x_{65} = 56.1593387717591$$