El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(\left(- \cos{\left(x \right)} - 1\right) - \sin{\left(x \right)}\right) e^{x} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\pi}{2}$$
$$x_{2} = \pi$$
Solución numérica$$x_{1} = -26.7035375555132$$
$$x_{2} = -1.5707963267949$$
$$x_{3} = -95.8185759344887$$
$$x_{4} = 34.5575191894877$$
$$x_{5} = -97.3893722612836$$
$$x_{6} = -39.2699081698724$$
$$x_{7} = -21.9911485751286$$
$$x_{8} = 10.9955742875643$$
$$x_{9} = -53.4070751110265$$
$$x_{10} = 23.5619449019235$$
$$x_{11} = -9.42477796076938$$
$$x_{12} = -34.5575191894877$$
$$x_{13} = 21.9911485751286$$
$$x_{14} = -803.058986110329$$
$$x_{15} = -47.1238898038469$$
$$x_{16} = -32.9867228626928$$
$$x_{17} = 28.2743338823081$$
$$x_{18} = -3.14159265358979$$
$$x_{19} = -65.9734457253857$$
$$x_{20} = -7.85398163397448$$
$$x_{21} = -58.1194640914112$$
$$x_{22} = -59.6902604182061$$
$$x_{23} = -98.374695319422$$
$$x_{24} = -91.106186954104$$
$$x_{25} = -89.5353906273091$$
$$x_{26} = -14.1371669411541$$
$$x_{27} = -64.4026493985908$$
$$x_{28} = 4.71238898038469$$
$$x_{29} = 9.42477796076938$$
$$x_{30} = -45.553093477052$$
$$x_{31} = -78.5398163397448$$
$$x_{32} = 17.2787595947439$$
$$x_{33} = -83.2522053201295$$
$$x_{34} = -20.4203522483337$$
$$x_{35} = 15.707963267949$$
$$x_{36} = -28.2743338823081$$
$$x_{37} = 29.845130209103$$
$$x_{38} = -102.101761241668$$
$$x_{39} = -41.858978693239$$
$$x_{40} = -15.707963267949$$
$$x_{41} = -51.8362787842316$$
$$x_{42} = -70.6858347057703$$
$$x_{43} = -72.2566310325652$$
$$x_{44} = -76.9690200129499$$