El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sqrt{3} \sin{\left(\frac{2 x}{3} \right)} + \cos{\left(\frac{2 x}{3} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\pi}{4}$$
Solución numérica$$x_{1} = 93.4623814442964$$
$$x_{2} = 51.0508806208341$$
$$x_{3} = -66.7588438887831$$
$$x_{4} = 55.7632696012188$$
$$x_{5} = 22.776546738526$$
$$x_{6} = 3.92699081698724$$
$$x_{7} = -43.1968989868597$$
$$x_{8} = -33.7721210260903$$
$$x_{9} = -47.9092879672443$$
$$x_{10} = 46.3384916404494$$
$$x_{11} = -302.378292908018$$
$$x_{12} = 36.9137136796801$$
$$x_{13} = -76.1836218495525$$
$$x_{14} = 13.3517687777566$$
$$x_{15} = -29.0597320457056$$
$$x_{16} = 60.4756585816035$$
$$x_{17} = -99.7455667514759$$
$$x_{18} = -10.2101761241668$$
$$x_{19} = 74.6128255227576$$
$$x_{20} = -80.8960108299372$$
$$x_{21} = -57.3340659280137$$
$$x_{22} = -62.0464549083984$$
$$x_{23} = -0.785398163397448$$
$$x_{24} = -85.6083998103219$$
$$x_{25} = 69.9004365423729$$
$$x_{26} = 65.1880475619882$$
$$x_{27} = 8.63937979737193$$
$$x_{28} = 102.887159405066$$
$$x_{29} = -14.9225651045515$$
$$x_{30} = 47386.998188585$$
$$x_{31} = 32.2013246992954$$
$$x_{32} = 18.0641577581413$$
$$x_{33} = -95.0331777710912$$
$$x_{34} = 98.174770424681$$
$$x_{35} = 41.6261026600648$$
$$x_{36} = -19.6349540849362$$
$$x_{37} = 84.037603483527$$
$$x_{38} = 88.7499924639117$$
$$x_{39} = -24.3473430653209$$
$$x_{40} = 27.4889357189107$$
$$x_{41} = 112.311937365835$$
$$x_{42} = -52.621676947629$$
$$x_{43} = -90.3207887907066$$
$$x_{44} = -5.49778714378214$$
$$x_{45} = 17331.3812716915$$
$$x_{46} = 79.3252145031423$$
$$x_{47} = -38.484510006475$$
$$x_{48} = -71.4712328691678$$