El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin^{2}{\left(4 x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = \frac{\pi}{4}$$
Solución numérica$$x_{1} = -23.561944904348$$
$$x_{2} = 47.9092880185894$$
$$x_{3} = -80.1106126153058$$
$$x_{4} = -73.827427284721$$
$$x_{5} = -54.1924733650013$$
$$x_{6} = -41.6261027066714$$
$$x_{7} = 50.2654824465509$$
$$x_{8} = 84.0376034158563$$
$$x_{9} = 21.9911485849612$$
$$x_{10} = -36.1283154690525$$
$$x_{11} = -51.8362787000453$$
$$x_{12} = -87.9645943624863$$
$$x_{13} = -95.8185758700054$$
$$x_{14} = -59.6902604533889$$
$$x_{15} = -1.57079630353569$$
$$x_{16} = -55.7632695908986$$
$$x_{17} = -40.0553062910974$$
$$x_{18} = -62.0464548704037$$
$$x_{19} = 73.8274273568149$$
$$x_{20} = 7.85398167150998$$
$$x_{21} = 91.8915851689525$$
$$x_{22} = 17.2787596266768$$
$$x_{23} = 23.5619448741498$$
$$x_{24} = 35.3429175928058$$
$$x_{25} = -18.0641577125705$$
$$x_{26} = 29.8451302381624$$
$$x_{27} = 94.2477796093559$$
$$x_{28} = 65.9734457508308$$
$$x_{29} = 2.35619444269882$$
$$x_{30} = 28.2743338657456$$
$$x_{31} = 9.42477790880273$$
$$x_{32} = 95.8185759026543$$
$$x_{33} = 68.3296401731209$$
$$x_{34} = -63.6172510458192$$
$$x_{35} = -69.1150382292202$$
$$x_{36} = -11.7809724253583$$
$$x_{37} = -85.6083998504339$$
$$x_{38} = 90.320788751167$$
$$x_{39} = 10.2101761581126$$
$$x_{40} = -19.6349541325247$$
$$x_{41} = 0$$
$$x_{42} = 51.8362788007148$$
$$x_{43} = 76.1836217752367$$
$$x_{44} = 3.9269908652109$$
$$x_{45} = 46.3384915956412$$
$$x_{46} = 40.0553062077493$$
$$x_{47} = -7.85398155964312$$
$$x_{48} = -98.1747704333549$$
$$x_{49} = -32.2013248486645$$
$$x_{50} = -81.6814090320685$$
$$x_{51} = -21.9911485866929$$
$$x_{52} = 69.9004365941675$$
$$x_{53} = -59.6902604903576$$
$$x_{54} = 43.9822971684981$$
$$x_{55} = -67.5442419591113$$
$$x_{56} = -33.7721210083536$$
$$x_{57} = -58.1194640416386$$
$$x_{58} = -45.5530933536183$$
$$x_{59} = 25.918139442264$$
$$x_{60} = -65.9734457671945$$
$$x_{61} = 86.3937979349862$$
$$x_{62} = 87.9645943321178$$
$$x_{63} = 92.6769832423968$$
$$x_{64} = 54.192473326569$$
$$x_{65} = -84.0376034505423$$
$$x_{66} = 42.4115008033467$$
$$x_{67} = -77.7544181730147$$
$$x_{68} = 32.2013247420843$$
$$x_{69} = 18.0641576074587$$
$$x_{70} = -14.1371668978389$$
$$x_{71} = 76.9690198050052$$
$$x_{72} = 98.1747704968058$$
$$x_{73} = -99.7455667547182$$
$$x_{74} = -76.1836218908518$$
$$x_{75} = -63.6172512794522$$
$$x_{76} = 62.0464548144506$$
$$x_{77} = 24.3473430188005$$
$$x_{78} = 72.2566310277531$$
$$x_{79} = -43.982297175552$$
$$x_{80} = 20.4203522453203$$
$$x_{81} = 76.1836219115335$$
$$x_{82} = 6.28318528533897$$
$$x_{83} = -23.5619448379282$$
$$x_{84} = -37.6991118742444$$
$$x_{85} = 64.4026493672268$$
$$x_{86} = -29.8451301191193$$
$$x_{87} = 56.548668013759$$
$$x_{88} = -15.707963294662$$