El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(\frac{\sin{\left(x \right)}}{\cos^{2}{\left(x \right)}} + \log{\left(1 \right)}\right) + \frac{\sin{\left(x \right)}}{\cos{\left(x \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
Solución numérica$$x_{1} = 37.6991118430775$$
$$x_{2} = -69.1150383789755$$
$$x_{3} = 65.9734548291061$$
$$x_{4} = 0$$
$$x_{5} = -72.2565564825269$$
$$x_{6} = -97.3894622485102$$
$$x_{7} = 6.28318530717959$$
$$x_{8} = 62.8318530717959$$
$$x_{9} = -81.6814089933346$$
$$x_{10} = 43.9822971502571$$
$$x_{11} = 21.9911516424236$$
$$x_{12} = 100.530964914873$$
$$x_{13} = 69.1150383789755$$
$$x_{14} = -94.2477796076938$$
$$x_{15} = 81.6814089933346$$
$$x_{16} = -6.28318530717959$$
$$x_{17} = -15.7079741767212$$
$$x_{18} = -100.530964914873$$
$$x_{19} = -53.4071604167044$$
$$x_{20} = 31.4159265358979$$
$$x_{21} = -28.2742545374405$$
$$x_{22} = 94.2477796076938$$
$$x_{23} = 50.2654824574367$$
$$x_{24} = 12.5663706143592$$
$$x_{25} = -75.398223686155$$
$$x_{26} = 18.8495559215388$$
$$x_{27} = -37.6991118430775$$
$$x_{28} = 28.2743275311686$$
$$x_{29} = -50.2654824574367$$
$$x_{30} = 72.256629295638$$
$$x_{31} = -87.9645943005142$$
$$x_{32} = -25.1327412287183$$
$$x_{33} = -43.9822971502571$$
$$x_{34} = 34.5574430335754$$
$$x_{35} = 75.398223686155$$
$$x_{36} = -56.5486677646163$$
$$x_{37} = -12.5663706143592$$
$$x_{38} = -18.8495559215388$$
$$x_{39} = 59.690349494722$$
$$x_{40} = 25.1327412287183$$
$$x_{41} = -9.42485865831298$$
$$x_{42} = -59.6902758189655$$
$$x_{43} = -31.4159265358979$$
$$x_{44} = -62.8318530717959$$
$$x_{45} = -65.9734547222506$$
$$x_{46} = 15.7080474515009$$
$$x_{47} = 56.5486677646163$$
$$x_{48} = 78.539744665834$$
$$x_{49} = -21.9911516411177$$
$$x_{50} = 87.9645943005142$$