El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{1 - \cos{\left(6 x \right)}}{1 - \cos{\left(4 x \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{\pi}{3}$$
Solución numérica$$x_{1} = 10.4719754400055$$
$$x_{2} = 19.8967536154132$$
$$x_{3} = 85.8701993931664$$
$$x_{4} = -70.1622358600752$$
$$x_{5} = 70.1622357638013$$
$$x_{6} = 76.4454211690532$$
$$x_{7} = -92.1533844367278$$
$$x_{8} = -58.6430629981683$$
$$x_{9} = 63.879050799395$$
$$x_{10} = -35.6047168941803$$
$$x_{11} = -2.09439497504799$$
$$x_{12} = 82.7286064986235$$
$$x_{13} = 80.634211419164$$
$$x_{14} = -26.1799387071124$$
$$x_{15} = -90.058989329145$$
$$x_{16} = 90.0589896456344$$
$$x_{17} = -27.2271363393197$$
$$x_{18} = 54.4542725926074$$
$$x_{19} = 61.7846555975745$$
$$x_{20} = -79.5870140747814$$
$$x_{21} = -8.37758012839707$$
$$x_{22} = -41.887902232616$$
$$x_{23} = -19.8967535753856$$
$$x_{24} = 2.09439532243769$$
$$x_{25} = 4.18879007422839$$
$$x_{26} = -39.7935068996971$$
$$x_{27} = 70.1622361204652$$
$$x_{28} = -17.8023583095536$$
$$x_{29} = 98.436569745598$$
$$x_{30} = 33.5103218438802$$
$$x_{31} = -24.0855435646378$$
$$x_{32} = 77.4926188133975$$
$$x_{33} = -49.2182849024277$$
$$x_{34} = -83.7758040726661$$
$$x_{35} = 38.7463093600923$$
$$x_{36} = 60.7374579289312$$
$$x_{37} = 16.7551607922785$$
$$x_{38} = 30.3687288699061$$
$$x_{39} = -68.0678407415963$$
$$x_{40} = 11.5191731078231$$
$$x_{41} = 55.5014702379907$$
$$x_{42} = 26.1799388843991$$
$$x_{43} = 48.1710872080297$$
$$x_{44} = -57.5958654839663$$
$$x_{45} = -85.870199099702$$
$$x_{46} = 24.0855439566483$$
$$x_{47} = -48.1710872835387$$
$$x_{48} = -5.23598777428875$$
$$x_{49} = -4.18879013079159$$
$$x_{50} = 92.1533847086727$$
$$x_{51} = 17.8023584454278$$
$$x_{52} = -76.4454211764036$$
$$x_{53} = 99.4837673796075$$
$$x_{54} = -77.4926188640614$$
$$x_{55} = 68.0678408006026$$
$$x_{56} = 55.50147024588$$
$$x_{57} = -32.4631240332191$$
$$x_{58} = -93.2005820205566$$
$$x_{59} = 4.18879028446587$$
$$x_{60} = 52.3598774564362$$
$$x_{61} = 8.37758028267448$$
$$x_{62} = 96.3421746276394$$
$$x_{63} = 26.1799387806108$$
$$x_{64} = 48.1710874940178$$
$$x_{65} = -10.4719754623862$$
$$x_{66} = 74.3510260423281$$
$$x_{67} = -61.7846554871544$$
$$x_{68} = 33.5103216772935$$
$$x_{69} = 41.8879022068544$$
$$x_{70} = -13.6135683053286$$
$$x_{71} = 13.6135680959101$$
$$x_{72} = -99.4837674398407$$
$$x_{73} = -71.2094334630856$$
$$x_{74} = 24.0855438736632$$
$$x_{75} = -63.8790505161445$$
$$x_{76} = 39.793507021549$$
$$x_{77} = 46.0766923655204$$
$$x_{78} = 83.7758041735064$$
$$x_{79} = -33.5103217122168$$
$$x_{80} = -54.4542726045832$$
$$x_{81} = -98.436569748619$$
$$x_{82} = -11.5191731361528$$
$$x_{83} = -46.0766921534563$$
$$x_{84} = -55.5014702881864$$
$$x_{85} = 32.4631240162586$$