El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(2 x \right)} - 2 \cos{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\pi}{2}$$
$$x_{2} = \frac{\pi}{2}$$
Solución numérica$$x_{1} = -17.2788609840697$$
$$x_{2} = 73.8274273593601$$
$$x_{3} = 4.71238898038469$$
$$x_{4} = 14.1371748702372$$
$$x_{5} = 26.7034393676549$$
$$x_{6} = -42.4114009567849$$
$$x_{7} = 7.85388676661539$$
$$x_{8} = -73.827404839395$$
$$x_{9} = 20.4203109469995$$
$$x_{10} = -61.2611612947608$$
$$x_{11} = -26.7035375555132$$
$$x_{12} = -89.5353906273091$$
$$x_{13} = 7.85402509748832$$
$$x_{14} = -23.5620274181456$$
$$x_{15} = 92.6769832808989$$
$$x_{16} = 61.261056745001$$
$$x_{17} = -29.8451151764072$$
$$x_{18} = -23.5619901092509$$
$$x_{19} = -80.1105783828951$$
$$x_{20} = 42.4115008234622$$
$$x_{21} = 67.5442420521806$$
$$x_{22} = -64.4026493985908$$
$$x_{23} = -7.85398163397448$$
$$x_{24} = 80.1106126665397$$
$$x_{25} = -14.1371669411541$$
$$x_{26} = 45.5531998278876$$
$$x_{27} = -1.5707963267949$$
$$x_{28} = 29.845130209103$$
$$x_{29} = -67.5442911095362$$
$$x_{30} = 17.2787595947439$$
$$x_{31} = -51.8362787842316$$
$$x_{32} = 6806.26055666465$$
$$x_{33} = 95.8186280030328$$
$$x_{34} = 58.1194603109949$$
$$x_{35} = -36.1282765608558$$
$$x_{36} = 98.9601685880785$$
$$x_{37} = -36.1283932235321$$
$$x_{38} = 23.5619449019235$$
$$x_{39} = -80.1106700221811$$
$$x_{40} = -73.8274109605032$$
$$x_{41} = 51.8363266129711$$
$$x_{42} = 1.5708994604091$$
$$x_{43} = -45.553093477052$$
$$x_{44} = -70.6858347057703$$
$$x_{45} = 48.6946861306418$$
$$x_{46} = -83.2522053201295$$
$$x_{47} = -95.8185759344887$$
$$x_{48} = -39.2699081698724$$
$$x_{49} = 64.4026120631021$$
$$x_{50} = 20.42030673321$$
$$x_{51} = -20.4203522483337$$
$$x_{52} = 64.402749985003$$
$$x_{53} = -86.3937014243547$$
$$x_{54} = -29.8451590169879$$
$$x_{55} = 70.6857397600493$$
$$x_{56} = 86.3937979737193$$
$$x_{57} = 14.137087451379$$
$$x_{58} = 36.1283155162826$$
$$x_{59} = -58.1194640914112$$