El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{1 - \cos{\left(2 x \right)}}{2 \sin{\left(x \right)} + 1} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = \pi$$
Solución numérica$$x_{1} = -81.681409048942$$
$$x_{2} = 78.5398162515449$$
$$x_{3} = 84.8230015570708$$
$$x_{4} = -21.9911481039959$$
$$x_{5} = -56.5486676709184$$
$$x_{6} = 3.1415931678281$$
$$x_{7} = 50.2654824457813$$
$$x_{8} = 65.9734455024251$$
$$x_{9} = -37.6991117291719$$
$$x_{10} = 50.26548269365$$
$$x_{11} = -100.530964819366$$
$$x_{12} = -21.9911485859165$$
$$x_{13} = 53.4070747070521$$
$$x_{14} = 0$$
$$x_{15} = 94.2477797128535$$
$$x_{16} = 97.3893718507143$$
$$x_{17} = -43.9822971774744$$
$$x_{18} = -25.1327408291929$$
$$x_{19} = 75.3982237719298$$
$$x_{20} = -3.14159273763214$$
$$x_{21} = -28.2743342033328$$
$$x_{22} = 40.8407044094494$$
$$x_{23} = 81.6814090896585$$
$$x_{24} = 21.9911485856619$$
$$x_{25} = -28.274333181316$$
$$x_{26} = 6.28318528168759$$
$$x_{27} = -12.5663705228515$$
$$x_{28} = -53.4070752043642$$
$$x_{29} = 65.9734457566856$$
$$x_{30} = -31.4159273163438$$
$$x_{31} = 31.415926624785$$
$$x_{32} = 34.557519099345$$
$$x_{33} = 21.9911483466045$$
$$x_{34} = -91.1061870298175$$
$$x_{35} = 100.530965257303$$
$$x_{36} = -59.6902604518029$$
$$x_{37} = 47.123889395252$$
$$x_{38} = -34.5575195705446$$
$$x_{39} = 43.9822971679369$$
$$x_{40} = -81.6814093507704$$
$$x_{41} = 94.2477796093405$$
$$x_{42} = 69.1150379569454$$
$$x_{43} = 87.9645943310174$$
$$x_{44} = -6.2831852138217$$
$$x_{45} = -50.2654823659009$$
$$x_{46} = 9.42477756631173$$
$$x_{47} = -15.7079632933379$$
$$x_{48} = 100.53096445561$$
$$x_{49} = 37.6991119380287$$
$$x_{50} = 97.3893722840591$$
$$x_{51} = -72.2566304522174$$
$$x_{52} = 28.2743338663949$$
$$x_{53} = 91.1061871595856$$
$$x_{54} = 25.1327409602613$$
$$x_{55} = -53.4070751143485$$
$$x_{56} = 47.1238901224492$$
$$x_{57} = 72.2566310278197$$
$$x_{58} = 62.8318534772876$$
$$x_{59} = -78.5398167021737$$
$$x_{60} = 56.5486672228695$$
$$x_{61} = 18.8495563267735$$
$$x_{62} = 6.28318551588125$$
$$x_{63} = -97.3893723558803$$
$$x_{64} = -87.9645943786287$$
$$x_{65} = -18.8495560958193$$
$$x_{66} = -47.1238898968649$$
$$x_{67} = -47.1238898840898$$
$$x_{68} = -69.1150379942896$$
$$x_{69} = 12.5663699687647$$
$$x_{70} = 91.1061871115338$$
$$x_{71} = -94.2477795182202$$
$$x_{72} = -62.831853183022$$
$$x_{73} = 18.8495564737097$$
$$x_{74} = -65.9734457591655$$
$$x_{75} = -37.6991118831511$$
$$x_{76} = -9.42477805262322$$