El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\tan{\left(2 x \right)} + e = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\operatorname{atan}{\left(e \right)}}{2}$$
Solución numérica$$x_{1} = 81.072267540826$$
$$x_{2} = 18.2404144690301$$
$$x_{3} = -69.7241798314841$$
$$x_{4} = -13.1755120668678$$
$$x_{5} = 95.2094344819801$$
$$x_{6} = -35.1666606419964$$
$$x_{7} = 26.0943961030046$$
$$x_{8} = -54.0162165635351$$
$$x_{9} = 77.9306748872362$$
$$x_{10} = 11.9572291618505$$
$$x_{11} = 98.3510271355699$$
$$x_{12} = -3.75073410609843$$
$$x_{13} = 4.10324752787605$$
$$x_{14} = -39.8790496223811$$
$$x_{15} = -97.9985137137922$$
$$x_{16} = -76.0073651386637$$
$$x_{17} = 33.9483777369791$$
$$x_{18} = 99.9218234623647$$
$$x_{19} = 55.9395263121076$$
$$x_{20} = -25.741882681227$$
$$x_{21} = 85.7846565212107$$
$$x_{22} = -94.8569210602024$$
$$x_{23} = -10.033919413278$$
$$x_{24} = 92.0678418283903$$
$$x_{25} = 76.3598785604413$$
$$x_{26} = -47.7330312563555$$
$$x_{27} = 62.2227116192872$$
$$x_{28} = -83.8613467726382$$
$$x_{29} = -32.0250679884066$$
$$x_{30} = 37.0899703905689$$
$$x_{31} = -79.1489577922535$$
$$x_{32} = 48.0855446781332$$
$$x_{33} = -61.8701981975096$$
$$x_{34} = 84.2138601944158$$
$$x_{35} = 74.7890822336464$$
$$x_{36} = -65.0117908510994$$
$$x_{37} = -91.7153284066126$$
$$x_{38} = -72.8657724850739$$
$$x_{39} = 82.6430638676209$$
$$x_{40} = 40.2315630441587$$
$$x_{41} = -17.8879010472525$$
$$x_{42} = 52.7979336585178$$
$$x_{43} = 70.0766932532617$$
$$x_{44} = 27.6651924297995$$