El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\tan^{4}{\left(\sin^{2}{\left(x \right)} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = \pi$$
Solución numérica$$x_{1} = 21.9917916060687$$
$$x_{2} = 81.7038029976261$$
$$x_{3} = 65.9753745739245$$
$$x_{4} = -9.44578087954157$$
$$x_{5} = 50.2644571713143$$
$$x_{6} = -87.9671658316325$$
$$x_{7} = 9.4184892757021$$
$$x_{8} = 37.7203419916031$$
$$x_{9} = -21.9917916060689$$
$$x_{10} = -31.4451037593946$$
$$x_{11} = 28.2727225479961$$
$$x_{12} = -75.3773908301369$$
$$x_{13} = -50.2466172330854$$
$$x_{14} = 34.5376070003022$$
$$x_{15} = -28.2548727964806$$
$$x_{16} = 59.7120740456236$$
$$x_{17} = -97.4125330340563$$
$$x_{18} = 15.7286068303864$$
$$x_{19} = -15.7107461830969$$
$$x_{20} = 56.5293038885519$$
$$x_{21} = 18.8292273998314$$
$$x_{22} = -53.4291608811973$$
$$x_{23} = 100.51270351678$$
$$x_{24} = 6.28098807779826$$
$$x_{25} = -81.6859471266899$$
$$x_{26} = -6.26313143573452$$
$$x_{27} = 72.2561918920277$$
$$x_{28} = 78.5210027316908$$
$$x_{29} = -72.2383647178198$$
$$x_{30} = 0$$
$$x_{31} = 87.9671658127259$$
$$x_{32} = -59.6942138458563$$
$$x_{33} = -94.2301152135548$$
$$x_{34} = -65.975374575403$$
$$x_{35} = -12.5767105787755$$
$$x_{36} = -37.702480177384$$
$$x_{37} = 43.9835831510857$$
$$x_{38} = -75.420847934848$$
$$x_{39} = -53.405482245942$$
$$x_{40} = -31.4374718645564$$
$$x_{41} = -43.9835831511332$$
$$x_{42} = 12.5459120758963$$
$$x_{43} = 94.2479266544709$$