El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\tan{\left(5 x \right)} + 3 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\operatorname{atan}{\left(3 \right)}}{5}$$
Solución numérica$$x_{1} = -15.9577724224286$$
$$x_{2} = 1.63514643767423$$
$$x_{3} = -54.2852027962241$$
$$x_{4} = -76.2763513713526$$
$$x_{5} = -19.7276836067364$$
$$x_{6} = -48.0020174890445$$
$$x_{7} = -56.170158388378$$
$$x_{8} = 43.7324879957775$$
$$x_{9} = 57.5554956715725$$
$$x_{10} = -73.7630772484808$$
$$x_{11} = 90.2280592689064$$
$$x_{12} = 40.5908953421877$$
$$x_{13} = 24.2546135435207$$
$$x_{14} = 50.643991833675$$
$$x_{15} = 87.7147851460346$$
$$x_{16} = 46.2457621186493$$
$$x_{17} = 2.26346496839218$$
$$x_{18} = -0.249809154479651$$
$$x_{19} = 68.2369106937778$$
$$x_{20} = -34.8073283439674$$
$$x_{21} = 72.0068218780856$$
$$x_{22} = -174.922360694072$$
$$x_{23} = -43.6037877740188$$
$$x_{24} = -69.9931660641731$$
$$x_{25} = 78.2900071852652$$
$$x_{26} = -95.7542258236094$$
$$x_{27} = 98.3962001682399$$
$$x_{28} = 846.723570253329$$
$$x_{29} = 235.997958395473$$
$$x_{30} = 93.9979704532142$$
$$x_{31} = 65.723636570906$$
$$x_{32} = 21.7413394206489$$
$$x_{33} = -51.7719286733523$$
$$x_{34} = 56.2988586101366$$