El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\log{\left(\sin^{2}{\left(2 x \right)} + 1 \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = \frac{\pi}{2}$$
Solución numérica$$x_{1} = -23.5619449829541$$
$$x_{2} = 42.4115007474832$$
$$x_{3} = -59.6902604557629$$
$$x_{4} = -117.809724540396$$
$$x_{5} = 64.4026493247646$$
$$x_{6} = -9.42477802145124$$
$$x_{7} = -20.420352344022$$
$$x_{8} = 73.8274274456951$$
$$x_{9} = -89.5353907111578$$
$$x_{10} = -37.6991118758441$$
$$x_{11} = -58.1194640163111$$
$$x_{12} = 21.9911485850845$$
$$x_{13} = -31.4159265906377$$
$$x_{14} = 81.6814090581985$$
$$x_{15} = 51.836278582425$$
$$x_{16} = -43.9822971750499$$
$$x_{17} = -80.1106125942565$$
$$x_{18} = 50.2654824464437$$
$$x_{19} = 6.28318528475519$$
$$x_{20} = -50.2654823735326$$
$$x_{21} = 72.2566310277353$$
$$x_{22} = -42.4115008918697$$
$$x_{23} = 95.8185760218175$$
$$x_{24} = 70.6858348570637$$
$$x_{25} = 15.7079633446801$$
$$x_{26} = 12.5663705486478$$
$$x_{27} = 20.4203521704334$$
$$x_{28} = 78.5398162633206$$
$$x_{29} = -75.3982237256642$$
$$x_{30} = 87.9645943340697$$
$$x_{31} = -6.28318522761904$$
$$x_{32} = 5433.38449412979$$
$$x_{33} = -64.4026494431402$$
$$x_{34} = -72.2566309470608$$
$$x_{35} = 42.4115009751971$$
$$x_{36} = -73.8274272825341$$
$$x_{37} = -65.9734457660766$$
$$x_{38} = 29.8451302927161$$
$$x_{39} = 94.2477796093541$$
$$x_{40} = -1.57079640638073$$
$$x_{41} = 67.544241832726$$
$$x_{42} = 4.71238921176697$$
$$x_{43} = -28.2743338003725$$
$$x_{44} = -36.128315438652$$
$$x_{45} = -94.2477795209258$$
$$x_{46} = -45.5530935592803$$
$$x_{47} = -39.269908175742$$
$$x_{48} = -15.7079632956745$$
$$x_{49} = -95.8185758691915$$
$$x_{50} = -14.1371668612674$$
$$x_{51} = 56.5486676911246$$
$$x_{52} = 54.9778712781626$$
$$x_{53} = 59.6902604876684$$
$$x_{54} = -97.3893722911209$$
$$x_{55} = 45.5530932854804$$
$$x_{56} = -7.85398152002251$$
$$x_{57} = -53.4070751587668$$
$$x_{58} = 28.2743338654564$$
$$x_{59} = 26.7035377701489$$
$$x_{60} = 37.6991119164664$$
$$x_{61} = -17.2787593842453$$
$$x_{62} = 7.85398171585272$$
$$x_{63} = -87.9645943605926$$
$$x_{64} = 51.8362788693288$$
$$x_{65} = 6.28318532735502$$
$$x_{66} = 29.845130017215$$
$$x_{67} = -21.9911485907283$$
$$x_{68} = -81.6814090354382$$
$$x_{69} = -21.9911485865678$$
$$x_{70} = 80.1106129826908$$
$$x_{71} = 48.6946863154063$$
$$x_{72} = 0$$
$$x_{73} = -51.8362786949248$$
$$x_{74} = 86.3937979022745$$
$$x_{75} = 89.5353903943382$$
$$x_{76} = 91.1061869629007$$
$$x_{77} = 23.5619447430246$$
$$x_{78} = 14.1371670504229$$
$$x_{79} = 92.6769833995109$$
$$x_{80} = 100.530964836059$$
$$x_{81} = 43.9822971689886$$
$$x_{82} = -67.5442421353514$$
$$x_{83} = 34.5575191195396$$
$$x_{84} = 36.1283152484364$$
$$x_{85} = -29.8451301067255$$
$$x_{86} = -86.3937979976827$$
$$x_{87} = 65.9734457519302$$
$$x_{88} = 1.57079620062432$$