El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\log{\left(2 - \cos{\left(x \right)} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = 2 \pi$$
Solución numérica$$x_{1} = 50.2654823218943$$
$$x_{2} = 37.6991120204243$$
$$x_{3} = -12.5663709007493$$
$$x_{4} = 87.9645943994199$$
$$x_{5} = -56.5486675079998$$
$$x_{6} = -62.8318533729422$$
$$x_{7} = -87.9645943587701$$
$$x_{8} = 87.9645943357613$$
$$x_{9} = -6.28318548766167$$
$$x_{10} = 43.9822971694279$$
$$x_{11} = -87.9645940588686$$
$$x_{12} = -50.2654822945446$$
$$x_{13} = 6.28318528425031$$
$$x_{14} = -56.548668047785$$
$$x_{15} = 6.2831854736161$$
$$x_{16} = 50.2654824463472$$
$$x_{17} = 43.9822963773283$$
$$x_{18} = -37.6991119153289$$
$$x_{19} = 6.28318520432519$$
$$x_{20} = -81.681409036985$$
$$x_{21} = 81.6814091775934$$
$$x_{22} = 94.2477796093525$$
$$x_{23} = -25.1327409323502$$
$$x_{24} = 18.849555666914$$
$$x_{25} = -75.3982238633872$$
$$x_{26} = -25.1327414875349$$
$$x_{27} = 56.5486679549878$$
$$x_{28} = 31.4159262466159$$
$$x_{29} = -18.8495556173862$$
$$x_{30} = 75.3982239550318$$
$$x_{31} = 62.8318521656398$$
$$x_{32} = -31.4159263253384$$
$$x_{33} = -37.6991110986159$$
$$x_{34} = 471.238897997772$$
$$x_{35} = 0$$
$$x_{36} = 18.849556215364$$
$$x_{37} = -18.8495562217774$$
$$x_{38} = -106.814150962879$$
$$x_{39} = -43.9822978837464$$
$$x_{40} = -31.41592659804$$
$$x_{41} = -43.9822971745782$$
$$x_{42} = -69.1150380803451$$
$$x_{43} = 81.6814087914149$$
$$x_{44} = 25.1327409295962$$
$$x_{45} = -43.9822969475826$$
$$x_{46} = 6.28318607700903$$
$$x_{47} = 12.5663702384678$$
$$x_{48} = -12032.2998626893$$
$$x_{49} = 87.9645935301424$$
$$x_{50} = -37.6991118771541$$
$$x_{51} = -81.6814083101974$$
$$x_{52} = 12.5663708151926$$
$$x_{53} = 18981.5028117004$$
$$x_{54} = -62.8318527689446$$
$$x_{55} = 94.2477803647286$$
$$x_{56} = -94.2477797633436$$
$$x_{57} = -75.3982234665557$$
$$x_{58} = 75.3982233942965$$
$$x_{59} = -12.5663703534729$$
$$x_{60} = -69.1150386418008$$
$$x_{61} = -81.681409038012$$
$$x_{62} = -50.2654826259573$$
$$x_{63} = 100.530964766032$$
$$x_{64} = 6.28318513123834$$
$$x_{65} = 12.5663704509757$$
$$x_{66} = 62.8318533627858$$
$$x_{67} = 43.9822972815896$$
$$x_{68} = 37.6991116514814$$
$$x_{69} = 31.415926800871$$
$$x_{70} = -94.2477794523601$$
$$x_{71} = 50.2654832291066$$
$$x_{72} = -6.28318513695273$$
$$x_{73} = 56.5486676084168$$
$$x_{74} = -87.9645949997818$$
$$x_{75} = 62.8318528215448$$
$$x_{76} = 69.1150380811757$$
$$x_{77} = 25.1327415339784$$
$$x_{78} = -31.4159267062921$$
$$x_{79} = -100.53096466271$$
$$x_{80} = 94.2477794373133$$
$$x_{81} = 69.1150386851472$$