El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$- 2 \sin{\left(x \right)} + 3 \cos{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \operatorname{atan}{\left(\frac{3}{2} \right)}$$
Solución numérica$$x_{1} = -64.9906520021383$$
$$x_{2} = -90.1233932308567$$
$$x_{3} = 16.6907569911963$$
$$x_{4} = 7.26597903042692$$
$$x_{5} = -8.44198423752205$$
$$x_{6} = -61.8490593485485$$
$$x_{7} = -68.1322446557281$$
$$x_{8} = 44.9650908735044$$
$$x_{9} = 95.2305733309411$$
$$x_{10} = 85.8057953701718$$
$$x_{11} = 60.6730541414534$$
$$x_{12} = -118.397727113165$$
$$x_{13} = 51.248276180684$$
$$x_{14} = 66.956239448633$$
$$x_{15} = 13.5491643376065$$
$$x_{16} = -46.1410960805996$$
$$x_{17} = -83.8402079236771$$
$$x_{18} = 0.982793723247329$$
$$x_{19} = 35.5403129127351$$
$$x_{20} = 38.6819055663249$$
$$x_{21} = 619.876546480437$$
$$x_{22} = -96.4065785380363$$
$$x_{23} = 63.8146467950432$$
$$x_{24} = -14.7251695447016$$
$$x_{25} = -2.15879893034246$$
$$x_{26} = 4.12438637683712$$
$$x_{27} = -21.0083548518812$$
$$x_{28} = 79.5226100629922$$
$$x_{29} = -55.565874041369$$
$$x_{30} = -86.9818005772669$$
$$x_{31} = -71.2738373093179$$
$$x_{32} = -42.9995034270098$$
$$x_{33} = -27.2915401590608$$
$$x_{34} = 123.504907213249$$
$$x_{35} = 82.664202716582$$
$$x_{36} = -36.7163181198302$$
$$x_{37} = 76.3810174094024$$
$$x_{38} = -74.4154299629077$$
$$x_{39} = -24.149947505471$$
$$x_{40} = 70.0978321022228$$
$$x_{41} = 22.9739422983759$$
$$x_{42} = -5.30039158393226$$
$$x_{43} = 48.1066835270942$$
$$x_{44} = 32.3987202591453$$
$$x_{45} = 26.1155349519657$$
$$x_{46} = -58.7074666949587$$
$$x_{47} = 73.2394247558126$$
$$x_{48} = -30.4331328126506$$
$$x_{49} = -77.5570226164975$$
$$x_{50} = -99.5481711916261$$
$$x_{51} = -93.2649858844465$$
$$x_{52} = -49.2826887341894$$
$$x_{53} = 57.5314614878636$$
$$x_{54} = 54.3898688342738$$
$$x_{55} = -1959.37102211678$$
$$x_{56} = -11.5835768911118$$
$$x_{57} = 1172.79685351224$$
$$x_{58} = 224.035872128123$$
$$x_{59} = 19.8323496447861$$
$$x_{60} = 88.9473880237615$$
$$x_{61} = 10.4075716840167$$
$$x_{62} = 98.3721659845309$$
$$x_{63} = -33.5747254662404$$
$$x_{64} = 29.2571276055555$$
$$x_{65} = 41.8234982199146$$
$$x_{66} = -17.8667621982914$$
$$x_{67} = 92.0889806773513$$
$$x_{68} = -80.6986152700873$$
$$x_{69} = -52.4242813877792$$
$$x_{70} = -39.85791077342$$