El gráfico de la función cruce el eje T con f = 0
o sea hay que resolver la ecuación:
$$7 \sin^{3}{\left(t \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje T:
Solución analítica$$t_{1} = 0$$
$$t_{2} = \pi$$
Solución numérica$$t_{1} = 65.9734548127967$$
$$t_{2} = 43.9823032527788$$
$$t_{3} = 28.2743275366207$$
$$t_{4} = 97.3893978428526$$
$$t_{5} = 31.4158812157011$$
$$t_{6} = 84.823034075932$$
$$t_{7} = 21.9911516417751$$
$$t_{8} = -21.9911516404356$$
$$t_{9} = 9.42474281067687$$
$$t_{10} = 0$$
$$t_{11} = -78.5397992432789$$
$$t_{12} = 100.531002707477$$
$$t_{13} = -40.8407553983808$$
$$t_{14} = 87.9646063100383$$
$$t_{15} = -119.380533126399$$
$$t_{16} = 72.2566292957527$$
$$t_{17} = 53.407020637795$$
$$t_{18} = -15.7079741496884$$
$$t_{19} = 40.8407567654285$$
$$t_{20} = -37.6991249589774$$
$$t_{21} = -87.9646059647861$$
$$t_{22} = -65.9734547037153$$
$$t_{23} = -9.42480464038606$$
$$t_{24} = -56.5486655300491$$
$$t_{25} = 6.2831766827342$$
$$t_{26} = -12.566394491012$$
$$t_{27} = -34.5575306179909$$
$$t_{28} = -15.7079508374868$$
$$t_{29} = 62.8318959401771$$
$$t_{30} = 94.247780189482$$
$$t_{31} = -59.6902757442614$$
$$t_{32} = -43.9823032312938$$
$$t_{33} = 50.2654784091363$$
$$t_{34} = -81.6814265052127$$