El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\log{\left(\sin{\left(3 x \right)} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{\pi}{6}$$
Solución numérica$$x_{1} = -79.0634150833848$$
$$x_{2} = -60.2138589919807$$
$$x_{3} = 88.4881928998348$$
$$x_{4} = -74.8746248673947$$
$$x_{5} = 71.7330325628745$$
$$x_{6} = 90.582587870936$$
$$x_{7} = 2.61799350657573$$
$$x_{8} = 10.9955743815506$$
$$x_{9} = 40.3171056756269$$
$$x_{10} = 75.9218225343885$$
$$x_{11} = 25.6563404481204$$
$$x_{12} = -45.5530936139552$$
$$x_{13} = 13.0899695565268$$
$$x_{14} = 61.2610563554495$$
$$x_{15} = -9.94837684179617$$
$$x_{16} = 80.1106129841105$$
$$x_{17} = -14.1371668195954$$
$$x_{18} = -12.0427717957865$$
$$x_{19} = -74.8746247915013$$
$$x_{20} = -30.8923276098518$$
$$x_{21} = 69.63863762184$$
$$x_{22} = -95.8185758675978$$
$$x_{23} = -53.9306741134037$$
$$x_{24} = 29.8451303466102$$
$$x_{25} = -43.458698624126$$
$$x_{26} = 78.0162175423989$$
$$x_{27} = -85.3466008748057$$
$$x_{28} = -30.8923276647958$$
$$x_{29} = -91.6297858097649$$
$$x_{30} = 65.4498469214818$$
$$x_{31} = -7.85398148275426$$
$$x_{32} = -89.5353907798946$$
$$x_{33} = 52.8834763368485$$
$$x_{34} = -3.66519148604333$$
$$x_{35} = 38.2227106405207$$
$$x_{36} = -58.1194639849907$$
$$x_{37} = 31.9395253695851$$
$$x_{38} = -5.75958652429544$$
$$x_{39} = -51.8362786866686$$
$$x_{40} = 44.5058957283325$$
$$x_{41} = -35.0811179450754$$
$$x_{42} = -16.2315618161685$$
$$x_{43} = 19.3731546352696$$
$$x_{44} = -18.3259567289184$$
$$x_{45} = -87.4409957974289$$
$$x_{46} = -72.7802300882992$$
$$x_{47} = -81.1578102285565$$
$$x_{48} = -1.57079644926881$$
$$x_{49} = 46.6002906906483$$
$$x_{50} = 8.90117919506081$$
$$x_{51} = 54.9778715082298$$
$$x_{52} = -41.3643036818294$$
$$x_{53} = 82.2050078074886$$
$$x_{54} = 96.8657734804063$$
$$x_{55} = -32.9867227390467$$
$$x_{56} = 73.8274275139696$$
$$x_{57} = 98.9601686397123$$
$$x_{58} = 34.0339203601559$$
$$x_{59} = 42.4115007144701$$
$$x_{60} = -47.6474886477959$$
$$x_{61} = -56.0250689622813$$
$$x_{62} = -76.9690198528362$$
$$x_{63} = 27.7507353658368$$
$$x_{64} = 84.2994028373596$$
$$x_{65} = -49.7418836877654$$
$$x_{66} = -68.5914396339443$$
$$x_{67} = -93.72418085038$$
$$x_{68} = -24.6091424952907$$
$$x_{69} = 86.3937978774848$$
$$x_{70} = 59.166661864973$$
$$x_{71} = -100.007366130772$$
$$x_{72} = -62.308253906611$$