El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\tan{\left(x \right)} - 3 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \operatorname{atan}{\left(3 \right)}$$
Solución numérica$$x_{1} = 92.3552327265023$$
$$x_{2} = 48.3729355762452$$
$$x_{3} = -83.5739558745262$$
$$x_{4} = -17.6005101491405$$
$$x_{5} = -99.2819191424751$$
$$x_{6} = 13.8154163867574$$
$$x_{7} = 35.806564961886$$
$$x_{8} = 20.098601693937$$
$$x_{9} = -39.5916587242691$$
$$x_{10} = -45.8748440314486$$
$$x_{11} = 7.53223107957784$$
$$x_{12} = 4.39063842598805$$
$$x_{13} = -36.4500660706793$$
$$x_{14} = 64.0808988441941$$
$$x_{15} = 38.9481576154758$$
$$x_{16} = 95.496825380092$$
$$x_{17} = -89.8571411817058$$
$$x_{18} = -30.1668807634997$$
$$x_{19} = -74.1491779137568$$
$$x_{20} = -23.8836954563201$$
$$x_{21} = -67.8659926065772$$
$$x_{22} = -96.1403264888853$$
$$x_{23} = 26.3817870011166$$
$$x_{24} = -52.1580293386282$$
$$x_{25} = 42.0897502690656$$
$$x_{26} = -61.5828072993976$$
$$x_{27} = -14.4589174955507$$
$$x_{28} = -136.981030985553$$
$$x_{29} = 70.3640841513737$$
$$x_{30} = -80.4323632209364$$
$$x_{31} = 86.0720474193227$$
$$x_{32} = -1.89254688119154$$
$$x_{33} = -8.17573218837112$$