El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(-2\right) \sin{\left(x - \frac{\pi}{3} \right)} - 1 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{\pi}{6}$$
$$x_{2} = \frac{3 \pi}{2}$$
Solución numérica$$x_{1} = -56.025068989018$$
$$x_{2} = -49.7418836818384$$
$$x_{3} = 73.8274273593601$$
$$x_{4} = 4.71238898038469$$
$$x_{5} = -7.85398163397448$$
$$x_{6} = 312.588469032184$$
$$x_{7} = -26.7035375555132$$
$$x_{8} = -89.5353906273091$$
$$x_{9} = -567.057473972958$$
$$x_{10} = 92.6769832808989$$
$$x_{11} = -76.9690200129499$$
$$x_{12} = -12.0427718387609$$
$$x_{13} = -24.60914245312$$
$$x_{14} = 61.261056745001$$
$$x_{15} = 42.4115008234622$$
$$x_{16} = 94.7713783832921$$
$$x_{17} = -37.1755130674792$$
$$x_{18} = 67.5442420521806$$
$$x_{19} = -64.4026493985908$$
$$x_{20} = -81.1578102177363$$
$$x_{21} = -14.1371669411541$$
$$x_{22} = -5.75958653158129$$
$$x_{23} = 31.9395253114962$$
$$x_{24} = -1.5707963267949$$
$$x_{25} = 69.6386371545737$$
$$x_{26} = 50.789081233035$$
$$x_{27} = 10.9955742875643$$
$$x_{28} = 17.2787595947439$$
$$x_{29} = -51.8362787842316$$
$$x_{30} = 75.9218224617533$$
$$x_{31} = -93.7241808320955$$
$$x_{32} = 44.5058959258554$$
$$x_{33} = 29.845130209103$$
$$x_{34} = 98.9601685880785$$
$$x_{35} = 25.6563400043166$$
$$x_{36} = 23.5619449019235$$
$$x_{37} = 63.3554518473942$$
$$x_{38} = 54.9778714378214$$
$$x_{39} = -62.3082542961976$$
$$x_{40} = 80.1106126665397$$
$$x_{41} = 19.3731546971371$$
$$x_{42} = 111.526539202438$$
$$x_{43} = -30.8923277602996$$
$$x_{44} = -45.553093477052$$
$$x_{45} = -70.6858347057703$$
$$x_{46} = 82.2050077689329$$
$$x_{47} = 0.523598775598299$$
$$x_{48} = -43.4586983746588$$
$$x_{49} = -87.4409955249159$$
$$x_{50} = -18.3259571459405$$
$$x_{51} = 48.6946861306418$$
$$x_{52} = -83.2522053201295$$
$$x_{53} = -100.007366139275$$
$$x_{54} = -95.8185759344887$$
$$x_{55} = 38.2227106186758$$
$$x_{56} = 13.0899693899575$$
$$x_{57} = -74.8746249105567$$
$$x_{58} = -39.2699081698724$$
$$x_{59} = -20.4203522483337$$
$$x_{60} = -32.9867228626928$$
$$x_{61} = -68.5914396033772$$
$$x_{62} = 88.4881930761125$$
$$x_{63} = 86.3937979737193$$
$$x_{64} = 57.0722665402146$$
$$x_{65} = 6.80678408277789$$
$$x_{66} = 36.1283155162826$$
$$x_{67} = -58.1194640914112$$