El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(\pi \sin{\left(x \right)} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = \frac{\pi}{2}$$
$$x_{3} = \pi$$
Solución numérica$$x_{1} = 86.3937978872531$$
$$x_{2} = -89.5353907491691$$
$$x_{3} = 14.1371671890086$$
$$x_{4} = 89.5353908574527$$
$$x_{5} = 7.85398174246011$$
$$x_{6} = 4.71238876496493$$
$$x_{7} = 58.1194647403301$$
$$x_{8} = -29.8451306015333$$
$$x_{9} = 73.8274274820787$$
$$x_{10} = -21.9911485751286$$
$$x_{11} = 15.707963267949$$
$$x_{12} = 80.11061279231$$
$$x_{13} = 1.57079655007211$$
$$x_{14} = -95.8185758680479$$
$$x_{15} = -81.6814089933346$$
$$x_{16} = -94.2477796076938$$
$$x_{17} = -23.5619450108686$$
$$x_{18} = -59.6902604182061$$
$$x_{19} = -43.9822971502571$$
$$x_{20} = -58.1194639980383$$
$$x_{21} = 95.8185760617828$$
$$x_{22} = -36.1283154177618$$
$$x_{23} = 43.9822971502571$$
$$x_{24} = -92.6769831117099$$
$$x_{25} = -51.8362787590776$$
$$x_{26} = 61.2610567784104$$
$$x_{27} = -29.8451300955812$$
$$x_{28} = -15.707963267949$$
$$x_{29} = -48.6946859865547$$
$$x_{30} = 32.986722821222$$
$$x_{31} = -1.5707964313417$$
$$x_{32} = -67.5442421697821$$
$$x_{33} = 23.5619451271472$$
$$x_{34} = 0$$
$$x_{35} = -65.9734457253857$$
$$x_{36} = -28.2743338823081$$
$$x_{37} = -73.827427580375$$
$$x_{38} = 29.845130322422$$
$$x_{39} = -50.2654824574367$$
$$x_{40} = -51.8362786893521$$
$$x_{41} = 39.2699082333776$$
$$x_{42} = 92.6769830745226$$
$$x_{43} = 54.9778713675722$$
$$x_{44} = -26.703537427063$$
$$x_{45} = 48.6946859194722$$
$$x_{46} = -4.71238887018063$$
$$x_{47} = -10.9955742528537$$
$$x_{48} = -83.2522055421265$$
$$x_{49} = -86.3937977595793$$
$$x_{50} = 83.2522053174084$$
$$x_{51} = 28.2743338823081$$
$$x_{52} = 65.9734457253857$$
$$x_{53} = 51.8362789022932$$
$$x_{54} = 42.4115007278557$$
$$x_{55} = -7.85398149705798$$
$$x_{56} = 17.2787596835375$$
$$x_{57} = 20.4203521482327$$
$$x_{58} = 14.1371671069452$$
$$x_{59} = -87.9645943005142$$
$$x_{60} = -14.1371668375986$$
$$x_{61} = -70.6858345482193$$
$$x_{62} = -45.5530935903486$$
$$x_{63} = -6.28318530717959$$
$$x_{64} = -20.4203520271444$$
$$x_{65} = 98.9601684731258$$
$$x_{66} = -61.2610569656206$$
$$x_{67} = -39.269908388929$$
$$x_{68} = 10.9955742805734$$
$$x_{69} = -7.85398222168475$$
$$x_{70} = -97.3893722612836$$
$$x_{71} = -64.4026491819759$$
$$x_{72} = 94.2477796076938$$
$$x_{73} = -73.8274272798494$$
$$x_{74} = 45.5530937040741$$
$$x_{75} = 70.6858344969335$$
$$x_{76} = 72.2566310325652$$
$$x_{77} = -76.9690197847253$$
$$x_{78} = 67.5442422808453$$
$$x_{79} = -80.1106125784393$$
$$x_{80} = -54.9778712889236$$
$$x_{81} = 26.7035373421466$$
$$x_{82} = -98.9601682594922$$
$$x_{83} = 56.5486677646163$$
$$x_{84} = -17.2787598120636$$
$$x_{85} = 100.530964914873$$
$$x_{86} = 6.28318530717959$$
$$x_{87} = -32.9867227769799$$
$$x_{88} = -42.4115006044957$$
$$x_{89} = 21.9911485751286$$
$$x_{90} = 87.9645943005142$$
$$x_{91} = 64.4026493075286$$
$$x_{92} = -72.2566310325652$$
$$x_{93} = 37.6991118430775$$
$$x_{94} = 50.2654824574367$$
$$x_{95} = 36.1283160002474$$
$$x_{96} = 80.1106131439072$$
$$x_{97} = -37.6991118430775$$
$$x_{98} = 78.5398163397448$$
$$x_{99} = 76.9690199184924$$