El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\log{\left(\frac{\cos^{2}{\left(x \right)}}{\sin{\left(x \right)}} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - i \log{\left(- \frac{\sqrt{\left(- i + \sqrt{5} i\right)^{2} + 4}}{2} - \frac{i}{2} + \frac{\sqrt{5} i}{2} \right)}$$
$$x_{2} = - i \log{\left(\frac{\sqrt{\left(- i + \sqrt{5} i\right)^{2} + 4}}{2} - \frac{i}{2} + \frac{\sqrt{5} i}{2} \right)}$$
Solución numérica$$x_{1} = -30.7496871034054$$
$$x_{2} = -49.5992430249442$$
$$x_{3} = -5.61694587468707$$
$$x_{4} = 19.5157953540313$$
$$x_{5} = -16.3742027004415$$
$$x_{6} = 88.6308337330067$$
$$x_{7} = 69.781277811468$$
$$x_{8} = -35.2237586219802$$
$$x_{9} = 2.47535322109728$$
$$x_{10} = -10.0910173932619$$
$$x_{11} = -99.8647254823809$$
$$x_{12} = -43.3160577177646$$
$$x_{13} = 8.75853852827686$$
$$x_{14} = 71.5903916000727$$
$$x_{15} = 76.0644631186476$$
$$x_{16} = 40.1744650641748$$
$$x_{17} = 63.4980925042884$$
$$x_{18} = -55.8824283321238$$
$$x_{19} = -93.5815401752013$$
$$x_{20} = -60.3564998506986$$
$$x_{21} = -79.2060557722373$$
$$x_{22} = -41.5069439291598$$
$$x_{23} = 44.6485365827496$$
$$x_{24} = 96.7231328287911$$
$$x_{25} = 25.7989806612109$$
$$x_{26} = -11.9001311818667$$
$$x_{27} = -54.073314543519$$
$$x_{28} = -3.80783208608231$$
$$x_{29} = -91.7724263865965$$
$$x_{30} = -74.7319842536625$$
$$x_{31} = 46.4576503713544$$
$$x_{32} = -47.7901292363394$$
$$x_{33} = 90.4399475216115$$
$$x_{34} = -68.4487989464829$$
$$x_{35} = 27.6080944498156$$
$$x_{36} = 52.740835678534$$
$$x_{37} = 38.36535127557$$
$$x_{38} = -85.4892410794169$$
$$x_{39} = 77.8735769072523$$
$$x_{40} = 32.0821659683904$$
$$x_{41} = -24.4665017962258$$
$$x_{42} = 84.1567622144319$$
$$x_{43} = -62.1656136393034$$
$$x_{44} = -98.0556116937761$$
$$x_{45} = 33.8912797569952$$
$$x_{46} = 82.3476484258271$$
$$x_{47} = -87.2983548680217$$
$$x_{48} = -18.1833164890462$$