El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(- \sin{\left(2 x \right)} + \cos{\left(x \right)}\right) + \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = 61.5941764612472$$
$$x_{2} = 80.443732382786$$
$$x_{3} = -66.3065654416319$$
$$x_{4} = -38.9367884536262$$
$$x_{5} = -89.2022709110629$$
$$x_{6} = 97.0562525450373$$
$$x_{7} = 40.5075847804211$$
$$x_{8} = 93.0101029971452$$
$$x_{9} = -7.52086191772823$$
$$x_{10} = -91.4393066703503$$
$$x_{11} = -28.6074535985544$$
$$x_{12} = 109.622623159397$$
$$x_{13} = 74.1605470756064$$
$$x_{14} = -70.3527149895241$$
$$x_{15} = -60.0233801344523$$
$$x_{16} = 42.7446205397085$$
$$x_{17} = -53.7401948272727$$
$$x_{18} = 86.7269176899656$$
$$x_{19} = -1.23767661054864$$
$$x_{20} = 15.3748435517027$$
$$x_{21} = -2881.17358305809$$
$$x_{22} = -16.0410829841952$$
$$x_{23} = 65.6403260091394$$
$$x_{24} = 99.2932883043247$$
$$x_{25} = 27.9412141660619$$
$$x_{26} = 59.3571407019598$$
$$x_{27} = 53.0739553947802$$
$$x_{28} = -9.75789767701564$$
$$x_{29} = -51.5031590679853$$
$$x_{30} = -64.0695296823445$$
$$x_{31} = -47.4570095200932$$
$$x_{32} = 67.8773617684268$$
$$x_{33} = -57.7863443751649$$
$$x_{34} = 46.7907700876006$$
$$x_{35} = -78.8729360559911$$
$$x_{36} = 382.036627127406$$
$$x_{37} = -145.750938675679$$
$$x_{38} = -26.370417839267$$
$$x_{39} = 90.7730672378577$$
$$x_{40} = -97.7224919775298$$
$$x_{41} = -3829.9345644422$$
$$x_{42} = 34.2243994732415$$
$$x_{43} = -13.8040472249078$$
$$x_{44} = -95.4854562182424$$
$$x_{45} = -22.3242682913748$$
$$x_{46} = 36.4614352325289$$
$$x_{47} = 21.6580288588823$$
$$x_{48} = 17.6118793109901$$
$$x_{49} = 30.1782499253493$$
$$x_{50} = 78.2066966234986$$
$$x_{51} = -3.47471236983605$$
$$x_{52} = -20.0872325320874$$
$$x_{53} = 84.4898819306782$$
$$x_{54} = -72.5897507488115$$
$$x_{55} = 23.8950646181697$$
$$x_{56} = -45.2199737608057$$
$$x_{57} = 71.923511316319$$
$$x_{58} = 5.04550869663095$$