El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(\frac{x}{2} \right)} \cos^{2}{\left(\frac{x}{2} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = - \pi$$
$$x_{3} = \pi$$
Solución numérica$$x_{1} = -18.8495559215388$$
$$x_{2} = 97.3893725487082$$
$$x_{3} = -47.1238900796845$$
$$x_{4} = -59.690260457721$$
$$x_{5} = 53.4070748643638$$
$$x_{6} = -56.5486677646163$$
$$x_{7} = -31.4159265358979$$
$$x_{8} = -97.3893725197317$$
$$x_{9} = 0$$
$$x_{10} = -53.4070754674785$$
$$x_{11} = 91.1061872775425$$
$$x_{12} = -94.2477796076938$$
$$x_{13} = -25.1327412287183$$
$$x_{14} = 87.9645943005142$$
$$x_{15} = 34.5575185962198$$
$$x_{16} = -53.4070752893571$$
$$x_{17} = -50.2654824574367$$
$$x_{18} = -43.9822971502571$$
$$x_{19} = 50.2654824574367$$
$$x_{20} = 34.5575190261676$$
$$x_{21} = -3.14159292467624$$
$$x_{22} = 28.2743338651903$$
$$x_{23} = -65.9734457649725$$
$$x_{24} = -91.1061866761793$$
$$x_{25} = -3.14159239565195$$
$$x_{26} = 59.6902609969082$$
$$x_{27} = 47.123890127433$$
$$x_{28} = -34.557518916051$$
$$x_{29} = -47.12388953524$$
$$x_{30} = 91.1061866390749$$
$$x_{31} = 12.5663706143592$$
$$x_{32} = -81.6814089933346$$
$$x_{33} = -40.8407048130561$$
$$x_{34} = -34.5575194070503$$
$$x_{35} = -91.1061872344816$$
$$x_{36} = 94.2477796076938$$
$$x_{37} = 81.6814089933346$$
$$x_{38} = 53.4070753939976$$
$$x_{39} = 84.8230018786881$$
$$x_{40} = 72.2566310277183$$
$$x_{41} = 15.7079634462463$$
$$x_{42} = 31.4159265358979$$
$$x_{43} = 40.8407047423983$$
$$x_{44} = 3.14159297692995$$
$$x_{45} = -72.2566308699577$$
$$x_{46} = -28.2743330936593$$
$$x_{47} = 84.8230005756266$$
$$x_{48} = 69.1150383789755$$
$$x_{49} = -9.42477813166605$$
$$x_{50} = -97.3893724469048$$
$$x_{51} = 37.6991118430775$$
$$x_{52} = 59.6902606040727$$
$$x_{53} = -78.5398165394017$$
$$x_{54} = -87.9645943005142$$
$$x_{55} = 62.8318530717959$$
$$x_{56} = 65.9734457529395$$
$$x_{57} = 40.8407042305363$$
$$x_{58} = -6.28318530717959$$
$$x_{59} = 21.9911485852011$$
$$x_{60} = -3.14159192272266$$
$$x_{61} = 25.1327412287183$$
$$x_{62} = -21.9911485864466$$
$$x_{63} = -40.8407041739456$$
$$x_{64} = 56.5486677646163$$
$$x_{65} = 47.1238894879615$$
$$x_{66} = -100.530964914873$$
$$x_{67} = 97.3893720028529$$
$$x_{68} = -62.8318530717959$$
$$x_{69} = -84.8230013251746$$
$$x_{70} = -72.2566304035062$$
$$x_{71} = -69.1150383789755$$
$$x_{72} = 43.9822971502571$$
$$x_{73} = -37.6991118430775$$
$$x_{74} = 84.8230013859467$$
$$x_{75} = 15.7079639719867$$
$$x_{76} = -59.6902609641181$$
$$x_{77} = 78.539815623306$$
$$x_{78} = -84.8230019629068$$
$$x_{79} = -75.398223686155$$
$$x_{80} = 9.42477772764248$$
$$x_{81} = 100.530964914873$$
$$x_{82} = 9.42477823907602$$
$$x_{83} = 75.398223686155$$
$$x_{84} = 6.28318530717959$$
$$x_{85} = -78.5398160713785$$
$$x_{86} = 78.5398161841438$$
$$x_{87} = -28.2743337117616$$
$$x_{88} = 18.8495559215388$$
$$x_{89} = 3.14159233724278$$
$$x_{90} = -9.42477842977577$$
$$x_{91} = -12.5663706143592$$
$$x_{92} = -15.7079632965628$$