El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$x \sin{\left(x + 5 \right)} \cos{\left(x - 6 \right)} \sin{\left(x + 7 \right)} \cos{\left(x - 8 \right)} \sin{\left(\frac{x}{3} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = -7$$
$$x_{2} = -5$$
$$x_{3} = 0$$
$$x_{4} = 6 - \frac{\pi}{2}$$
$$x_{5} = 8 - \frac{\pi}{2}$$
$$x_{6} = \frac{\pi}{2} + 6$$
$$x_{7} = \frac{\pi}{2} + 8$$
Solución numérica$$x_{1} = 13.8539816339745$$
$$x_{2} = 88.1106126665397$$
$$x_{3} = -39.5575191894877$$
$$x_{4} = 6.4292036732051$$
$$x_{5} = -56.5486677646163$$
$$x_{6} = -36.4115008234622$$
$$x_{7} = 98.6769832808989$$
$$x_{8} = -32.1327412287183$$
$$x_{9} = -54.1238898038469$$
$$x_{10} = -10.1415926535898$$
$$x_{11} = -72.1106126665397$$
$$x_{12} = -45.8362787842316$$
$$x_{13} = 92.3893722612836$$
$$x_{14} = -85.5398163397448$$
$$x_{15} = -87.8185759344887$$
$$x_{16} = 79.8230016469244$$
$$x_{17} = -50.1194640914112$$
$$x_{18} = 20.1371669411541$$
$$x_{19} = 51.5486677646163$$
$$x_{20} = -28.9911485751286$$
$$x_{21} = -8.13716694115407$$
$$x_{22} = 84.106186954104$$
$$x_{23} = 37.845130209103$$
$$x_{24} = -6.13716694115407$$
$$x_{25} = 33.8407044966673$$
$$x_{26} = -41.5575191894877$$
$$x_{27} = 50.4115008234622$$
$$x_{28} = -63.5486677646163$$
$$x_{29} = -14.4247779607694$$
$$x_{30} = 95.5309649148734$$
$$x_{31} = -28.1283155162826$$
$$x_{32} = -91.8230016469244$$
$$x_{33} = -17.5663706143592$$
$$x_{34} = 81.8274273593601$$
$$x_{35} = 70.398223686155$$
$$x_{36} = 18.1327412287183$$
$$x_{37} = -15.5619449019235$$
$$x_{38} = 40.1238898038469$$
$$x_{39} = 0$$
$$x_{40} = 35.845130209103$$
$$x_{41} = 57.8362787842316$$
$$x_{42} = -43.8362787842316$$
$$x_{43} = -76.1150383789755$$
$$x_{44} = -3.85840734641021$$
$$x_{45} = -80.3937979737193$$
$$x_{46} = -61.5486677646163$$
$$x_{47} = 22.1371669411541$$
$$x_{48} = 57.8318530717959$$
$$x_{49} = -59.5442420521806$$
$$x_{50} = 59.8362787842316$$
$$x_{51} = -94.1017612416683$$
$$x_{52} = -25.8495559215388$$
$$x_{53} = 28.2743338823081$$
$$x_{54} = 65.9734457253857$$
$$x_{55} = -21.845130209103$$
$$x_{56} = -19.5663706143592$$
$$x_{57} = 99.814150222053$$
$$x_{58} = -74.1106126665397$$
$$x_{59} = 11.8495559215388$$
$$x_{60} = -47.8407044966673$$
$$x_{61} = -96.1017612416683$$
$$x_{62} = 2.42477796076938$$
$$x_{63} = 4.42477796076938$$
$$x_{64} = 90.3893722612836$$
$$x_{65} = 54.6946861306418$$
$$x_{66} = 32.7035375555132$$
$$x_{67} = -83.5398163397448$$
$$x_{68} = 26.4159265358979$$
$$x_{69} = -77.2522053201295$$
$$x_{70} = 29.5619449019235$$
$$x_{71} = 72.4026493985908$$
$$x_{72} = -1.85398163397448$$
$$x_{73} = -98.106186954104$$
$$x_{74} = 94.2477796076938$$
$$x_{75} = 62.1150383789754$$
$$x_{76} = -30.1283155162826$$
$$x_{77} = 0.146018366025517$$
$$x_{78} = 44.1283155162826$$
$$x_{79} = -23.845130209103$$
$$x_{80} = -11.2787595947439$$
$$x_{81} = -89.8185759344887$$
$$x_{82} = 24.4159265358979$$
$$x_{83} = 79.8274273593601$$
$$x_{84} = 48.4070751110265$$
$$x_{85} = -236.336263712055$$
$$x_{86} = 68.398223686155$$
$$x_{87} = 46.4070751110265$$
$$x_{88} = -67.8274273593601$$
$$x_{89} = 15.8539816339745$$
$$x_{90} = 7.5707963267949$$
$$x_{91} = -81.5353906273091$$
$$x_{92} = 77.8230016469244$$
$$x_{93} = -52.1194640914112$$
$$x_{94} = -37.6991118430775$$
$$x_{95} = -69.8318530717959$$