El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\tan^{2}{\left(x \right)}}{1 - \cos{\left(x \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = 84.8230006960568$$
$$x_{2} = -59.6902604584246$$
$$x_{3} = -91.1061862208803$$
$$x_{4} = -84.8230003302448$$
$$x_{5} = 21.9911485852429$$
$$x_{6} = -47.1238903740717$$
$$x_{7} = -78.5398158202657$$
$$x_{8} = 15.7079639180421$$
$$x_{9} = -34.5575186404877$$
$$x_{10} = -40.8407059577918$$
$$x_{11} = 53.4070757243867$$
$$x_{12} = 3.14159415311091$$
$$x_{13} = 21.9911470034978$$
$$x_{14} = -84.8230032080754$$
$$x_{15} = 47.1238914071164$$
$$x_{16} = 78.5398164739659$$
$$x_{17} = -21.9911485864037$$
$$x_{18} = -78.5398155696622$$
$$x_{19} = 59.6902606635824$$
$$x_{20} = 65.9734457533066$$
$$x_{21} = -28.2743336670775$$
$$x_{22} = 84.8230000925129$$
$$x_{23} = -9.42477817625918$$
$$x_{24} = 91.1061877173719$$
$$x_{25} = -78.5398162989309$$
$$x_{26} = -28.2743334269043$$
$$x_{27} = -34.5575184008182$$
$$x_{28} = -65.9734457645781$$
$$x_{29} = -3.14159319339173$$
$$x_{30} = -15.7079632968794$$
$$x_{31} = 15.7079634979884$$
$$x_{32} = 72.2566310277123$$
$$x_{33} = 97.3893729097862$$
$$x_{34} = 72.2566300161296$$
$$x_{35} = 78.5398161512818$$
$$x_{36} = 34.5575189877436$$
$$x_{37} = -53.4070753407667$$
$$x_{38} = -40.8407030923754$$
$$x_{39} = -72.2566308316648$$
$$x_{40} = 40.8407039856137$$
$$x_{41} = 84.8230011630704$$
$$x_{42} = 47.123888519249$$
$$x_{43} = 9.42477854101497$$
$$x_{44} = -97.3893725058208$$
$$x_{45} = 3.14159128436603$$
$$x_{46} = -91.1061875565645$$
$$x_{47} = 97.3893733340218$$
$$x_{48} = 91.1061857476007$$
$$x_{49} = 28.274333865096$$