El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(1 - \cos{\left(3 x \right)}\right) \left(- \sin{\left(2 x \right)} + 2 \tan{\left(x \right)}\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
Solución numérica$$x_{1} = -0.00231765937064296$$
$$x_{2} = -90.0589893262434$$
$$x_{3} = 78.5397617781518$$
$$x_{4} = 10.4719754149671$$
$$x_{5} = 43.9825183594456$$
$$x_{6} = -9.4248341105532$$
$$x_{7} = -46.0766921494917$$
$$x_{8} = -59.6902756308872$$
$$x_{9} = 8.37758027594926$$
$$x_{10} = -28.2742765405245$$
$$x_{11} = 46.0766923327432$$
$$x_{12} = -79.5870140821134$$
$$x_{13} = -81.6821417701444$$
$$x_{14} = 48.1710875317851$$
$$x_{15} = 15.7080214499647$$
$$x_{16} = 94.2478033786606$$
$$x_{17} = -2.09439497036349$$
$$x_{18} = 34.5574635725452$$
$$x_{19} = -83.7758040705397$$
$$x_{20} = -85.8701991481314$$
$$x_{21} = 65.9734547876023$$
$$x_{22} = -35.604716901487$$
$$x_{23} = 52.3598774506673$$
$$x_{24} = 85.8701993972745$$
$$x_{25} = 0$$
$$x_{26} = -97.389427219391$$
$$x_{27} = -21.9911516394019$$
$$x_{28} = 6.28283015343438$$
$$x_{29} = -15.7079741088947$$
$$x_{30} = 50.2653167153794$$
$$x_{31} = -53.4071311214517$$
$$x_{32} = -92.1533846177873$$
$$x_{33} = 96.3421746230425$$
$$x_{34} = 41.8879022116746$$
$$x_{35} = -37.6996561012896$$
$$x_{36} = 54.4542728076009$$
$$x_{37} = -72.2565749460944$$
$$x_{38} = 72.2566292959236$$
$$x_{39} = 28.2743275447995$$
$$x_{40} = -39.7935068925054$$
$$x_{41} = 87.9650364881714$$
$$x_{42} = 59.6903189708094$$
$$x_{43} = 21.9911516407816$$
$$x_{44} = -33.510321669889$$
$$x_{45} = -65.9734546760391$$
$$x_{46} = -43.982518352659$$
$$x_{47} = 4.18879030222116$$
$$x_{48} = -87.9650360077111$$