El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{- \sin{\left(\sin{\left(x \right)} \right)} + \tan{\left(\tan{\left(x \right)} \right)}}{- \sin{\left(x \right)} + \tan{\left(x \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = 4.32728526758813$$
$$x_{2} = 52.2213824970282$$
$$x_{3} = -29.6680711682306$$
$$x_{4} = -102.486864954465$$
$$x_{5} = 1688.64474362082$$
$$x_{6} = -29.8796306126345$$
$$x_{7} = 28847.4191789135$$
$$x_{8} = -1.74785536766736$$
$$x_{9} = 205.597259769259$$
$$x_{10} = 42.666863498193$$
$$x_{11} = 39.1714403624214$$
$$x_{12} = 96.2036796472853$$
$$x_{13} = -20.1649895736029$$
$$x_{14} = -23.4954171693482$$
$$x_{15} = -17.5341222694746$$
$$x_{16} = 73.7723881454623$$
$$x_{17} = -67.5953518933822$$
$$x_{18} = -58.174503305309$$
$$x_{19} = -73.8883020269395$$
$$x_{20} = -36.1268538873264$$
$$x_{21} = -39.655011882669$$
$$x_{22} = 92.2918795681023$$
$$x_{23} = -96.2036796472853$$
$$x_{24} = 1.95590003959146$$
$$x_{25} = 70.4304720310396$$
$$x_{26} = -89.9204943401057$$
$$x_{27} = 55.2332341125522$$
$$x_{28} = 375.390795688372$$
$$x_{29} = 111.141435489641$$
$$x_{30} = 20.414138088974$$
$$x_{31} = 149.481013720246$$
$$x_{32} = 30.1004928838338$$
$$x_{33} = 8.23908534677105$$
$$x_{34} = -35.7432118034861$$
$$x_{35} = 98.783109547206$$
$$x_{36} = 10.9115124455202$$
$$x_{37} = 64.2603406698377$$
$$x_{38} = -58.1191822073437$$
$$x_{39} = -300.04447518957$$
$$x_{40} = 17.2962256345186$$
$$x_{41} = -764.592707436318$$
$$x_{42} = 26.4481748807825$$
$$x_{43} = -61.5164194197317$$
$$x_{44} = 36.2706242450357$$
$$x_{45} = -108.365327735712$$
$$x_{46} = -83.6373090329261$$
$$x_{47} = 79.7255089537432$$
$$x_{48} = 14.1734157621097$$
$$x_{49} = -23.4778830598794$$
$$x_{50} = 10.6104705747677$$
$$x_{51} = -95.8355261113998$$
$$x_{52} = 105.129268814369$$
$$x_{53} = -14.061922879902$$
$$x_{54} = -42.0263971106656$$
$$x_{55} = 27.0886412683098$$
$$x_{56} = -73.8145812536186$$
$$x_{57} = -86.0086942609228$$
$$x_{58} = -33.3718265754894$$
$$x_{59} = 1151.77881125346$$
$$x_{60} = 67.5882851250914$$
$$x_{61} = 95.814453982878$$
$$x_{62} = -51.8486265932496$$
$$x_{63} = 36.1794253574842$$
$$x_{64} = -7.75551382652349$$
$$x_{65} = -51.81221032832$$
$$x_{66} = 86.0086942609228$$
$$x_{67} = 410.15490033434$$
$$x_{68} = 58.1192918665548$$
$$x_{69} = -114.525823127274$$
$$x_{70} = -4.75108129669496$$
$$x_{71} = 14.5222706539506$$
$$x_{72} = 83.3187330527048$$
$$x_{73} = -664.332761153352$$
$$x_{74} = -64.14728672386$$
$$x_{75} = 48.3095824178452$$
$$x_{76} = -79.9965275856509$$
$$x_{77} = 45.9381971898486$$