El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{1 - \sin{\left(\frac{\pi x}{2 \pi} \right)}}{4} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \pi$$
Solución numérica$$x_{1} = -47.1238907880697$$
$$x_{2} = 15.7079642015151$$
$$x_{3} = -9.42477695202933$$
$$x_{4} = 78.5398173426089$$
$$x_{5} = 65.9734449700497$$
$$x_{6} = 91.1061865344779$$
$$x_{7} = 3.14159309886503$$
$$x_{8} = 15.707964515786$$
$$x_{9} = 28.2743330336433$$
$$x_{10} = -9.42477888681821$$
$$x_{11} = -59.6902612768606$$
$$x_{12} = 15.7079634545545$$
$$x_{13} = 28.2743331152018$$
$$x_{14} = -34.5575202139462$$
$$x_{15} = -59.6902594740223$$
$$x_{16} = -9.42477728929078$$
$$x_{17} = 78.5398170241526$$
$$x_{18} = 65.973446491358$$
$$x_{19} = -72.2566334561862$$
$$x_{20} = 40.8407056713041$$
$$x_{21} = 3.14159420425446$$
$$x_{22} = 53.4070761022138$$
$$x_{23} = 91.1061882841015$$
$$x_{24} = -21.9911485864393$$
$$x_{25} = -84.8230006270304$$
$$x_{26} = -185.353961803293$$
$$x_{27} = -47.123889537864$$
$$x_{28} = 65.9734465921985$$
$$x_{29} = 15.7079622686986$$
$$x_{30} = 40.840705066392$$
$$x_{31} = -21.9911493421841$$
$$x_{32} = -59.690260457841$$
$$x_{33} = 53.4070740857414$$
$$x_{34} = 53.4070745656255$$
$$x_{35} = -84.8229998635885$$
$$x_{36} = -47.1238901219454$$
$$x_{37} = -84.8230020968984$$
$$x_{38} = 15.7079637526952$$
$$x_{39} = -97.389371602892$$
$$x_{40} = -9.42477813898924$$
$$x_{41} = 40.8407035181637$$
$$x_{42} = 78.5398162375612$$
$$x_{43} = 91.1061853899956$$
$$x_{44} = -9.4247756652542$$
$$x_{45} = 15.7079626060796$$
$$x_{46} = -34.5575188772018$$
$$x_{47} = -47.1238918185856$$
$$x_{48} = -72.2566320255231$$
$$x_{49} = 40.8407055286336$$
$$x_{50} = 3.14159163746103$$
$$x_{51} = 28.2743348137489$$
$$x_{52} = 3.14159131070869$$
$$x_{53} = -84.8230012168657$$
$$x_{54} = -21.9911477182159$$
$$x_{55} = 65.9734457530019$$
$$x_{56} = 91.1061874144797$$
$$x_{57} = -47.1238892482917$$
$$x_{58} = -34.5575192441112$$
$$x_{59} = -21.9911477831607$$
$$x_{60} = 28.2743346582797$$
$$x_{61} = -47.1238887712007$$
$$x_{62} = -72.2566301070981$$
$$x_{63} = -97.3893724564835$$
$$x_{64} = -72.2566317074393$$
$$x_{65} = -72.2566304993376$$
$$x_{66} = -72.2566308637416$$
$$x_{67} = -84.8230026657071$$
$$x_{68} = 16741.5472539237$$
$$x_{69} = 103.672556563684$$
$$x_{70} = 40.840704648726$$
$$x_{71} = -97.389373195247$$
$$x_{72} = 91.106187979742$$
$$x_{73} = 78.5398154218754$$
$$x_{74} = 40.8407041945824$$
$$x_{75} = 91.1061859410303$$
$$x_{76} = 53.4070754394033$$
$$x_{77} = -21.9911494917557$$
$$x_{78} = 53.4070749521362$$
$$x_{79} = -59.6902596538675$$
$$x_{80} = 3.14159367655067$$
$$x_{81} = 15.7079632663563$$
$$x_{82} = -9.42477839608986$$
$$x_{83} = 78.5398161786998$$
$$x_{84} = -34.5575197491116$$
$$x_{85} = 28.2743338651742$$
$$x_{86} = -59.6902611573573$$
$$x_{87} = 65.9734447951365$$
$$x_{88} = -34.5575182039711$$
$$x_{89} = -97.3893712473886$$
$$x_{90} = 14944.5562553885$$
$$x_{91} = -84.8230027834212$$
$$x_{92} = 78.539815851887$$
$$x_{93} = 53.40707409148$$
$$x_{94} = 3.14159221873501$$