El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(- 2 \sin{\left(x \right)} \cos{\left(x \right)} + 1\right) \left(- \sin{\left(x \right)} + \cos{\left(x \right)}\right) + 1 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{\pi}{2}$$
Solución numérica$$x_{1} = 102.101761241668$$
$$x_{2} = -97.3893722612836$$
$$x_{3} = -72.2566310325652$$
$$x_{4} = -59.6902604182061$$
$$x_{5} = 699.004365423729$$
$$x_{6} = 556.061899685393$$
$$x_{7} = 64.4026493985908$$
$$x_{8} = 9.42477796076938$$
$$x_{9} = 7.85398163397448$$
$$x_{10} = -419.402619254237$$
$$x_{11} = 39.2699081698724$$
$$x_{12} = 84.8230016469244$$
$$x_{13} = 409.977841293468$$
$$x_{14} = -21.9911485751286$$
$$x_{15} = -92.6769832808989$$
$$x_{16} = -23.5619449019235$$
$$x_{17} = 28.2743338823081$$
$$x_{18} = -28.2743338823081$$
$$x_{19} = -80.1106126665397$$
$$x_{20} = -65.9734457253857$$
$$x_{21} = -91.106186954104$$
$$x_{22} = 45.553093477052$$
$$x_{23} = -67.5442420521806$$
$$x_{24} = 51.8362787842316$$
$$x_{25} = 40.8407044966673$$
$$x_{26} = 76.9690200129499$$
$$x_{27} = -53.4070751110265$$
$$x_{28} = -3.14159265358979$$
$$x_{29} = 21.9911485751286$$
$$x_{30} = -4.71238898038469$$
$$x_{31} = 95.8185759344887$$
$$x_{32} = 34.5575191894877$$
$$x_{33} = -86.3937979737193$$
$$x_{34} = -36.1283155162826$$
$$x_{35} = -15.707963267949$$
$$x_{36} = 83.2522053201295$$
$$x_{37} = -17.2787595947439$$
$$x_{38} = 53.4070751110265$$
$$x_{39} = 20.4203522483337$$
$$x_{40} = 65.9734457253857$$
$$x_{41} = -48.6946861306418$$
$$x_{42} = 91.106186954104$$
$$x_{43} = 59.6902604182061$$
$$x_{44} = 14.1371669411541$$
$$x_{45} = -73.8274273593601$$
$$x_{46} = 89.5353906273091$$
$$x_{47} = 78.5398163397448$$
$$x_{48} = 15.707963267949$$
$$x_{49} = 58.1194640914112$$
$$x_{50} = 72.2566310325652$$
$$x_{51} = 1.5707963267949$$
$$x_{52} = -47.1238898038469$$
$$x_{53} = -42.4115008234622$$
$$x_{54} = -9.42477796076938$$
$$x_{55} = -34.5575191894877$$
$$x_{56} = -29.845130209103$$