El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$2 \sin{\left(x \right)} - \cos{\left(2 x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = -37.3243774103688$$
$$x_{2} = 19.2242903542475$$
$$x_{3} = 27.8995994495994$$
$$x_{4} = 63.2065875045046$$
$$x_{5} = 90.7314525213953$$
$$x_{6} = 78.1650819070361$$
$$x_{7} = -34.9322536221965$$
$$x_{8} = -85.1977360796332$$
$$x_{9} = -150.421712939601$$
$$x_{10} = 25.5074756614271$$
$$x_{11} = -47.4986242365556$$
$$x_{12} = -129.18003322989$$
$$x_{13} = 34.182784756779$$
$$x_{14} = -78.9145507724536$$
$$x_{15} = -66.3481801580944$$
$$x_{16} = -24.7580067960096$$
$$x_{17} = -22.3658830078373$$
$$x_{18} = 65.5987112926769$$
$$x_{19} = 69.4897728116842$$
$$x_{20} = -16.0826977006577$$
$$x_{21} = -93.8730451749851$$
$$x_{22} = 0.37473443270874$$
$$x_{23} = 82.0561434260434$$
$$x_{24} = -75.0234892534463$$
$$x_{25} = -43.6075627175484$$
$$x_{26} = -81.3066745606259$$
$$x_{27} = 84.4482672142157$$
$$x_{28} = 50.6402168901454$$
$$x_{29} = 31.7906609686067$$
$$x_{30} = -72.631365465274$$
$$x_{31} = 6.65791973988833$$
$$x_{32} = 97.0146378285748$$
$$x_{33} = -3.51632708629853$$
$$x_{34} = -28.6490683150169$$
$$x_{35} = -91.4809213868127$$
$$x_{36} = 21.6164141424198$$
$$x_{37} = 53.0323406783177$$
$$x_{38} = 94.6225140404025$$
$$x_{39} = 2.76685822088105$$
$$x_{40} = -49.890748024728$$
$$x_{41} = 38.0738462757863$$
$$x_{42} = 9.05004352806064$$
$$x_{43} = -100.156230482165$$
$$x_{44} = 2126.48349204758$$
$$x_{45} = 15.3332288352402$$
$$x_{46} = -56.1739333319075$$
$$x_{47} = 46.7491553711382$$
$$x_{48} = -68.7403039462667$$
$$x_{49} = 100.905699347582$$
$$x_{50} = -97.7641066939923$$
$$x_{51} = -12.1916361816504$$
$$x_{52} = -5.90845087447085$$
$$x_{53} = -53.7818095437352$$
$$x_{54} = -60.0649948509148$$
$$x_{55} = 56.923402197325$$
$$x_{56} = -41.215438929376$$
$$x_{57} = 44.3570315829658$$
$$x_{58} = 88.339328733223$$
$$x_{59} = 71.8818965998565$$
$$x_{60} = -18.47482148883$$
$$x_{61} = 40.4659700639586$$
$$x_{62} = 735.50741537272$$
$$x_{63} = 75.7729581188638$$
$$x_{64} = -62.4571186390871$$
$$x_{65} = -87.5898598678055$$
$$x_{66} = -9.79951239347812$$