El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\sin{\left(x \right)}}{2} + \cos{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \operatorname{atan}{\left(2 \right)}$$
Solución numérica$$x_{1} = 55.4415190468222$$
$$x_{2} = 42.875148432463$$
$$x_{3} = -70.2221870967695$$
$$x_{4} = 52.2999263932324$$
$$x_{5} = 61.7247043540018$$
$$x_{6} = -19.9567046393328$$
$$x_{7} = -4.24874137138388$$
$$x_{8} = -26.2398899465124$$
$$x_{9} = 80.5742602755405$$
$$x_{10} = -95.3549283254879$$
$$x_{11} = -23.0982972929226$$
$$x_{12} = 89.9990382363099$$
$$x_{13} = 20.8839998573345$$
$$x_{14} = -51.3726311752308$$
$$x_{15} = 86.8574455827201$$
$$x_{16} = 11.4592218965651$$
$$x_{17} = 30.3087778181038$$
$$x_{18} = 71.1494823147711$$
$$x_{19} = 64.8662970075916$$
$$x_{20} = -16.8151119857431$$
$$x_{21} = 24.0255925109243$$
$$x_{22} = -10.5319266785635$$
$$x_{23} = -41.9478532144614$$
$$x_{24} = 2.0344439357957$$
$$x_{25} = -82.7885577111287$$
$$x_{26} = 27.167185164514$$
$$x_{27} = -104.779706286257$$
$$x_{28} = 14.6008145501549$$
$$x_{29} = -38.8062605608716$$
$$x_{30} = 74.2910749683609$$
$$x_{31} = -45.0894458680512$$
$$x_{32} = -29.3814826001022$$
$$x_{33} = 17.7424072037447$$
$$x_{34} = 68.0078896611814$$
$$x_{35} = 8.31762924297529$$
$$x_{36} = -79.6469650575389$$
$$x_{37} = -243.009783044208$$
$$x_{38} = 93.1406308898997$$
$$x_{39} = -98.4965209790777$$
$$x_{40} = -13.6735193321533$$
$$x_{41} = -73.3637797503593$$
$$x_{42} = -54.5142238288206$$
$$x_{43} = -7.39033402497368$$
$$x_{44} = -57.6558164824104$$
$$x_{45} = 46.0167410860528$$
$$x_{46} = 58.583111700412$$
$$x_{47} = 5.1760365893855$$
$$x_{48} = -76.5053724039491$$
$$x_{49} = 99.4238161970793$$
$$x_{50} = -1.10714871779409$$
$$x_{51} = -32.523075253692$$
$$x_{52} = -60.7974091360002$$
$$x_{53} = -92.2133356718981$$
$$x_{54} = 33.4503704716936$$
$$x_{55} = 96.2822235434895$$
$$x_{56} = -89.0717430183083$$
$$x_{57} = -85.9301503647185$$
$$x_{58} = 36.5919631252834$$
$$x_{59} = 83.7158529291303$$
$$x_{60} = 49.1583337396426$$
$$x_{61} = -63.93900178959$$
$$x_{62} = -48.231038521641$$
$$x_{63} = -67.0805944431797$$
$$x_{64} = 39.7335557788732$$
$$x_{65} = 77.4326676219507$$
$$x_{66} = -35.6646679072818$$