El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(x \right)} 2 \cos{\left(x \right)} - \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = - \frac{\pi}{3}$$
$$x_{3} = \frac{\pi}{3}$$
Solución numérica$$x_{1} = 12.5663706143592$$
$$x_{2} = -13.6135681655558$$
$$x_{3} = 78.5398163397448$$
$$x_{4} = -65.9734457253857$$
$$x_{5} = -15.707963267949$$
$$x_{6} = -34.5575191894877$$
$$x_{7} = -879.645943005142$$
$$x_{8} = 50.2654824574367$$
$$x_{9} = 81.6814089933346$$
$$x_{10} = -57.5958653158129$$
$$x_{11} = -36.6519142918809$$
$$x_{12} = 76.4454212373516$$
$$x_{13} = 63.8790506229925$$
$$x_{14} = -75.398223686155$$
$$x_{15} = -24.0855436775217$$
$$x_{16} = -1.0471975511966$$
$$x_{17} = 95.2949771588904$$
$$x_{18} = 42.9350995990605$$
$$x_{19} = 56.5486677646163$$
$$x_{20} = 80.634211442138$$
$$x_{21} = 70.162235930172$$
$$x_{22} = 1.0471975511966$$
$$x_{23} = -19.8967534727354$$
$$x_{24} = 15.707963267949$$
$$x_{25} = -80.634211442138$$
$$x_{26} = 86.9173967493176$$
$$x_{27} = -59.6902604182061$$
$$x_{28} = 21.9911485751286$$
$$x_{29} = 6.28318530717959$$
$$x_{30} = 26.1799387799149$$
$$x_{31} = -87.9645943005142$$
$$x_{32} = 9.42477796076938$$
$$x_{33} = -28.2743338823081$$
$$x_{34} = 7.33038285837618$$
$$x_{35} = 57.5958653158129$$
$$x_{36} = -9.42477796076938$$
$$x_{37} = 59.6902604182061$$
$$x_{38} = -68.0678408277789$$
$$x_{39} = 28.2743338823081$$
$$x_{40} = -47.1238898038469$$
$$x_{41} = -3.14159265358979$$
$$x_{42} = 94.2477796076938$$
$$x_{43} = -72.2566310325652$$
$$x_{44} = -74.3510261349584$$
$$x_{45} = 53.4070751110265$$
$$x_{46} = -97.3893722612836$$
$$x_{47} = 37.6991118430775$$
$$x_{48} = -50.2654824574367$$
$$x_{49} = -94.2477796076938$$
$$x_{50} = 17.8023583703422$$
$$x_{51} = -63.8790506229925$$
$$x_{52} = 24.0855436775217$$
$$x_{53} = -7.33038285837618$$
$$x_{54} = 32.4631240870945$$
$$x_{55} = -37.6991118430775$$
$$x_{56} = 19.8967534727354$$
$$x_{57} = -95.2949771588904$$
$$x_{58} = 74.3510261349584$$
$$x_{59} = 51.3126800086333$$
$$x_{60} = -26.1799387799149$$
$$x_{61} = -61.7846555205993$$
$$x_{62} = -81.6814089933346$$
$$x_{63} = 43.9822971502571$$
$$x_{64} = -78.5398163397448$$
$$x_{65} = -89.0117918517108$$
$$x_{66} = -17.8023583703422$$
$$x_{67} = 97.3893722612836$$
$$x_{68} = 36.6519142918809$$
$$x_{69} = -31.4159265358979$$
$$x_{70} = -99.4837673636768$$
$$x_{71} = 0$$
$$x_{72} = 30.3687289847013$$
$$x_{73} = 68.0678408277789$$
$$x_{74} = 61.7846555205993$$
$$x_{75} = -21.9911485751286$$
$$x_{76} = -55.5014702134197$$
$$x_{77} = 100.530964914873$$
$$x_{78} = 34.5575191894877$$
$$x_{79} = 65.9734457253857$$
$$x_{80} = -45.0294947014537$$
$$x_{81} = -11.5191730631626$$
$$x_{82} = -53.4070751110265$$
$$x_{83} = -51.3126800086333$$
$$x_{84} = 40.8407044966673$$
$$x_{85} = 13.6135681655558$$
$$x_{86} = -6.28318530717959$$
$$x_{87} = -30.3687289847013$$
$$x_{88} = 11.5191730631626$$
$$x_{89} = -43.9822971502571$$
$$x_{90} = 84.8230016469244$$
$$x_{91} = 72.2566310325652$$
$$x_{92} = -70.162235930172$$
$$x_{93} = 87.9645943005142$$