El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$- \log{\left(\left|{x}\right| \right)} + \tan{\left(\left|{2 x + \frac{21}{5}}\right| \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = -86.0271919287279$$
$$x_{2} = 1.07999531203819$$
$$x_{3} = 51.9685150647502$$
$$x_{4} = -42.0246141352023$$
$$x_{5} = 80.2547043652544$$
$$x_{6} = -49.8840851872359$$
$$x_{7} = -0.700311040326136$$
$$x_{8} = -1.82850579207324$$
$$x_{9} = -5.76769722861147$$
$$x_{10} = -2.46726545964872$$
$$x_{11} = 3.03087325986359$$
$$x_{12} = -27.8721751197594$$
$$x_{13} = -21.5775861089627$$
$$x_{14} = 14.2132026569855$$
$$x_{15} = 11.0545834443975$$
$$x_{16} = -98.5967411727984$$
$$x_{17} = 12.6347947877379$$
$$x_{18} = -57.7424056686942$$
$$x_{19} = -79.7421568111162$$
$$x_{20} = -20.0030765311911$$
$$x_{21} = 22.0910942826298$$
$$x_{22} = -4.14992803748541$$
$$x_{23} = 44.1093967837781$$
$$x_{24} = 29.9582912599973$$
$$x_{25} = 7.88467981784663$$
$$x_{26} = 4.68114882184429$$
$$x_{27} = 89.682162855162$$
$$x_{28} = 58.2550473780007$$
$$x_{29} = 39.3932159936929$$
$$x_{30} = -16.8524279134892$$
$$x_{31} = 36.248692007195$$
$$x_{32} = -64.0284822425519$$
$$x_{33} = 6.29035660048762$$
$$x_{34} = -100.167894369941$$
$$x_{35} = -13.6984928957993$$
$$x_{36} = 40.9653489117563$$
$$x_{37} = -35.7357881853735$$
$$x_{38} = 9.47172086750235$$