El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{x \tan{\left(5 x \right)}}{\sin{\left(2 x^{2} \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{4 \pi}{5}$$
$$x_{2} = - \frac{3 \pi}{5}$$
$$x_{3} = - \frac{2 \pi}{5}$$
$$x_{4} = - \frac{\pi}{5}$$
$$x_{5} = \frac{\pi}{5}$$
$$x_{6} = \frac{2 \pi}{5}$$
$$x_{7} = \frac{3 \pi}{5}$$
$$x_{8} = \frac{4 \pi}{5}$$
$$x_{9} = \pi$$
Solución numérica$$x_{1} = 65.9734457253857$$
$$x_{2} = -8.16814089933346$$
$$x_{3} = -21.9911485751286$$
$$x_{4} = 89.8495498926681$$
$$x_{5} = -52.1504380495906$$
$$x_{6} = -10.0530964914873$$
$$x_{7} = 23.8761041672824$$
$$x_{8} = -25.7610597594363$$
$$x_{9} = 11.9380520836412$$
$$x_{10} = 76.026542216873$$
$$x_{11} = -76.026542216873$$
$$x_{12} = -15.707963267949$$
$$x_{13} = 98.0176907920015$$
$$x_{14} = 33.9292006587698$$
$$x_{15} = 16.3362817986669$$
$$x_{16} = -57.8053048260522$$
$$x_{17} = -3.76991118430775$$
$$x_{18} = 10.0530964914873$$
$$x_{19} = 54.0353936417444$$
$$x_{20} = -64.0884901332318$$
$$x_{21} = -5.65486677646163$$
$$x_{22} = -27.6460153515902$$
$$x_{23} = -98.0176907920015$$
$$x_{24} = 30.159289474462$$
$$x_{25} = -18.8495559215388$$
$$x_{26} = 6.28318530717959$$
$$x_{27} = 1.88495559215388$$
$$x_{28} = 60.318578948924$$
$$x_{29} = 74.1415866247191$$
$$x_{30} = 43.9822971502571$$
$$x_{31} = 72.2566310325652$$
$$x_{32} = 77.9114978090269$$
$$x_{33} = -32.0442450666159$$
$$x_{34} = 79.7964534011807$$
$$x_{35} = -91.734505484822$$
$$x_{36} = -33.9292006587698$$
$$x_{37} = -69.7433569096934$$
$$x_{38} = -43.3539786195391$$
$$x_{39} = -1.88495559215388$$
$$x_{40} = -93.6194610769758$$
$$x_{41} = 50.2654824574367$$
$$x_{42} = 40.2123859659494$$
$$x_{43} = -40.2123859659494$$
$$x_{44} = 94.2477796076938$$
$$x_{45} = -47.7522083345649$$
$$x_{46} = -79.7964534011807$$