El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\tan^{2}{\left(2 x \right)}}{\sin^{2}{\left(3 x \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = -67.5442423245381$$
$$x_{2} = -95.8185758654778$$
$$x_{3} = -7.85398143133134$$
$$x_{4} = -80.1106125197199$$
$$x_{5} = -73.8274272730885$$
$$x_{6} = 14.137167205544$$
$$x_{7} = 80.1106130360873$$
$$x_{8} = -39.2699087337983$$
$$x_{9} = 86.3937978336791$$
$$x_{10} = -58.1194639277832$$
$$x_{11} = -23.5619451276462$$
$$x_{12} = -1.5707965322491$$
$$x_{13} = 73.8274276596049$$
$$x_{14} = 64.402649244214$$
$$x_{15} = 29.8451298593587$$
$$x_{16} = -89.5353909265437$$
$$x_{17} = 51.8362790563861$$
$$x_{18} = 95.8185762655661$$
$$x_{19} = 29.8451304556181$$
$$x_{20} = -14.1371667395837$$
$$x_{21} = -51.8362786742353$$
$$x_{22} = -61.2610567910819$$
$$x_{23} = -36.1283153344615$$
$$x_{24} = 20.4203520614059$$
$$x_{25} = 7.85398185703946$$
$$x_{26} = 76.9690202966857$$
$$x_{27} = -29.8451300635516$$
$$x_{28} = 42.4115006535053$$
$$x_{29} = 36.1283155396432$$
$$x_{30} = -45.5530937249962$$