El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\sqrt{1 - \cos^{2}{\left(2 x \right)}}}{3 - \tan{\left(x \right)}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = \frac{\pi}{2}$$
$$x_{3} = \pi$$
Solución numérica$$x_{1} = -14.1371668832646$$
$$x_{2} = -1.57079669385188$$
$$x_{3} = -34.5575191894877$$
$$x_{4} = 3.1415926535898$$
$$x_{5} = 89.5353905780434$$
$$x_{6} = -43.9822971502571$$
$$x_{7} = 28.2743338823081$$
$$x_{8} = 14.1371669834845$$
$$x_{9} = 45.5530934499154$$
$$x_{10} = -12.5663706143592$$
$$x_{11} = 59.6902604182061$$
$$x_{12} = -40.8407044966673$$
$$x_{13} = -98.9601686267913$$
$$x_{14} = 50.2654824574367$$
$$x_{15} = -51.8362787420083$$
$$x_{16} = 7.85398169307897$$
$$x_{17} = -73.8274273190247$$
$$x_{18} = -84.8230016469244$$
$$x_{19} = 64.4026491601497$$
$$x_{20} = 15.707963267949$$
$$x_{21} = -15.707963267949$$
$$x_{22} = -105.243354282192$$
$$x_{23} = -37.6991118430775$$
$$x_{24} = 25.1327412287183$$
$$x_{25} = -72.2566310325652$$
$$x_{26} = -29.8451301658165$$
$$x_{27} = -7.85398159059304$$
$$x_{28} = 1.57079632465356$$
$$x_{29} = 42.4115005498465$$
$$x_{30} = 23.5619448874686$$
$$x_{31} = -18.8495559215388$$
$$x_{32} = 53.4070751110265$$
$$x_{33} = -67.5442426753318$$
$$x_{34} = 47.1238898038469$$
$$x_{35} = 21.9911485751285$$
$$x_{36} = -45.5530939904938$$
$$x_{37} = 65.9734457253857$$
$$x_{38} = -23.5619453330591$$
$$x_{39} = -80.1106126131939$$
$$x_{40} = 21.9911485751286$$
$$x_{41} = 29.8451302692889$$
$$x_{42} = -6.28318530717959$$
$$x_{43} = -65.9734457253857$$
$$x_{44} = 81.6814089933346$$
$$x_{45} = 51.836278845372$$
$$x_{46} = 130.376094556578$$
$$x_{47} = -86.3937979421648$$
$$x_{48} = -64.4026493732499$$
$$x_{49} = -42.4115008055648$$
$$x_{50} = -56.5486677646163$$
$$x_{51} = 97.3893722612836$$
$$x_{52} = 37.6991118430775$$
$$x_{53} = -21.9911485751286$$
$$x_{54} = 69.1150383789755$$
$$x_{55} = -50.2654824574367$$
$$x_{56} = -94.2477796076938$$
$$x_{57} = 29.8451304245054$$
$$x_{58} = 4.71238857740406$$
$$x_{59} = -62.8318530717959$$
$$x_{60} = -20.4203522394489$$
$$x_{61} = -59.6902604182061$$
$$x_{62} = -53.4070751110265$$
$$x_{63} = -36.1283154597504$$
$$x_{64} = -87.9645943005142$$
$$x_{65} = -28.2743338823081$$
$$x_{66} = 86.3937977651364$$
$$x_{67} = 95.8185759971779$$
$$x_{68} = 67.5442420128826$$
$$x_{69} = 6.28318530717959$$
$$x_{70} = -58.1194640363891$$
$$x_{71} = 80.1106126966779$$
$$x_{72} = 58.1194641273429$$
$$x_{73} = 0$$
$$x_{74} = 87.9645943005142$$
$$x_{75} = 43.9822971502571$$
$$x_{76} = -76.9690197527207$$
$$x_{77} = 152.367243882963$$
$$x_{78} = 36.1283155562063$$
$$x_{79} = 31.4159265358979$$
$$x_{80} = 72.2566310325652$$
$$x_{81} = 73.8274274213337$$
$$x_{82} = -89.5353914041409$$
$$x_{83} = -7.85398153554784$$
$$x_{84} = 94.2477796076938$$
$$x_{85} = -100.530964914873$$
$$x_{86} = 91.106186954104$$
$$x_{87} = 9.42477796076938$$
$$x_{88} = -78.5398163397448$$
$$x_{89} = -95.8185758967522$$
$$x_{90} = -81.6814089933346$$
$$x_{91} = 20.4203519326203$$
$$x_{92} = 75.398223686155$$