El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\log{\left(\cos{\left(x \right)} \right)}}{x} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 2 \pi$$
Solución numérica$$x_{1} = -94.2477821181699$$
$$x_{2} = 94.2477796464198$$
$$x_{3} = -37.6991118773063$$
$$x_{4} = -62.831853342621$$
$$x_{5} = 37.6991120412136$$
$$x_{6} = -6.28318565828478$$
$$x_{7} = 31.41592690231$$
$$x_{8} = 81.6814086046101$$
$$x_{9} = 25.1327418222459$$
$$x_{10} = -100.530965520471$$
$$x_{11} = 50.2654824463258$$
$$x_{12} = 62.8318541847386$$
$$x_{13} = 6.28318518794684$$
$$x_{14} = -69.115038338702$$
$$x_{15} = -37.6991119922772$$
$$x_{16} = -18.8495564858153$$
$$x_{17} = -62.831854107628$$
$$x_{18} = 56.5486680287307$$
$$x_{19} = 25.1327414643316$$
$$x_{20} = -31.4159241420874$$
$$x_{21} = 87.9645941066782$$
$$x_{22} = 50.2654825255164$$
$$x_{23} = -43.9822972719791$$
$$x_{24} = 75.3982227288473$$
$$x_{25} = 12.5663704278981$$
$$x_{26} = 12.5663726458004$$
$$x_{27} = 69.1150378552832$$
$$x_{28} = -43.9822972155883$$
$$x_{29} = -69.1150373702266$$
$$x_{30} = -62.8318524860201$$
$$x_{31} = 31.4159255197709$$
$$x_{32} = -50.2654827892748$$
$$x_{33} = -75.398221304309$$
$$x_{34} = -81.6814090383932$$
$$x_{35} = 25.1327406361642$$
$$x_{36} = 12.5663709619672$$
$$x_{37} = -56.5486688149424$$
$$x_{38} = 87.9645943080185$$
$$x_{39} = 75.3982240692465$$
$$x_{40} = -37.6991117193748$$
$$x_{41} = 94.2477796093521$$
$$x_{42} = -87.9645943784668$$
$$x_{43} = 81.6814067419791$$
$$x_{44} = -56.5486674103626$$
$$x_{45} = -31.4159267241418$$
$$x_{46} = 18.8495569463446$$
$$x_{47} = 69.1150378169902$$
$$x_{48} = 43.9822972608986$$
$$x_{49} = 81.681409202583$$
$$x_{50} = 100.53096475248$$
$$x_{51} = -6.28318510435776$$
$$x_{52} = -25.1327401479732$$
$$x_{53} = -94.2477794368085$$
$$x_{54} = 18.8495555620182$$
$$x_{55} = 69.1150387526606$$
$$x_{56} = -87.9645943583769$$
$$x_{57} = 43.9822971694838$$
$$x_{58} = -6.28318735811168$$
$$x_{59} = -25.1327416014258$$
$$x_{60} = -56.5486681966342$$
$$x_{61} = 50.2654824911769$$
$$x_{62} = 31.4159268762441$$
$$x_{63} = 94.2477796395327$$
$$x_{64} = 75.3982237987167$$
$$x_{65} = 6.28318528398235$$
$$x_{66} = 56.5486698298894$$
$$x_{67} = 87.9645943360203$$
$$x_{68} = -18.8495546630502$$
$$x_{69} = -81.6814090343752$$
$$x_{70} = -50.265482275851$$
$$x_{71} = 62.8318534985437$$
$$x_{72} = -94.2477799278511$$
$$x_{73} = -50.2654849051414$$
$$x_{74} = -69.11503874655$$
$$x_{75} = 100.530965148878$$
$$x_{76} = -62.8318536719726$$
$$x_{77} = -12.5663702322309$$
$$x_{78} = -81.6814088542447$$
$$x_{79} = 43.9822969697753$$
$$x_{80} = -18.8495552966503$$
$$x_{81} = -43.9822971744709$$
$$x_{82} = 56.5486675921582$$
$$x_{83} = -31.4159265657376$$
$$x_{84} = 37.6991094417897$$
$$x_{85} = -75.3982238853375$$
$$x_{86} = 37.6991117778923$$
$$x_{87} = -100.53096457419$$
$$x_{88} = 18.8495564016278$$
$$x_{89} = -75.3982234907138$$
$$x_{90} = 6.28318553619608$$
$$x_{91} = 69.1150390046369$$
$$x_{92} = -25.1327415788287$$
$$x_{93} = 62.8318527325798$$
$$x_{94} = -12.5663715613679$$
$$x_{95} = -12.5663711678178$$
$$x_{96} = -87.9645943759507$$