El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\sin^{2}{\left(3 x \right)}}{\sqrt{1 - 3 x^{2}} - 1} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{\pi}{3}$$
Solución numérica$$x_{1} = 83.7758041738755$$
$$x_{2} = -68.0678407177314$$
$$x_{3} = -2.09439495341714$$
$$x_{4} = 32.4631239373878$$
$$x_{5} = -53.407075547284$$
$$x_{6} = -11.5191731251854$$
$$x_{7} = -17.8023582939866$$
$$x_{8} = -43.9822971850546$$
$$x_{9} = -4.18879001288644$$
$$x_{10} = 61.7846556072272$$
$$x_{11} = 76.4454210731484$$
$$x_{12} = -72.2566309870438$$
$$x_{13} = -28.2743338947898$$
$$x_{14} = 59.6902603644233$$
$$x_{15} = -41.8879020073281$$
$$x_{16} = -31.4159264946804$$
$$x_{17} = -99.4837673648131$$
$$x_{18} = 98.436569643698$$
$$x_{19} = -50.2654824494464$$
$$x_{20} = -75.3982236304748$$
$$x_{21} = 8.37758024407212$$
$$x_{22} = -90.0589893044654$$
$$x_{23} = -35.6047168432264$$
$$x_{24} = -70.1622357540224$$
$$x_{25} = -87.9645943668825$$
$$x_{26} = 2.09439524233262$$
$$x_{27} = 74.3510259933659$$
$$x_{28} = -9.42477797919813$$
$$x_{29} = -21.9911485925066$$
$$x_{30} = 56.5486678712747$$
$$x_{31} = -85.8701982254335$$
$$x_{32} = 34.557519296064$$
$$x_{33} = -53.4070750921797$$
$$x_{34} = 41.887902141974$$
$$x_{35} = 15.7079632015201$$
$$x_{36} = 43.9822971706907$$
$$x_{37} = 81.6814089893432$$
$$x_{38} = -19.8967533927881$$
$$x_{39} = -33.5103216930609$$
$$x_{40} = 24.0855436989385$$
$$x_{41} = -55.501470253734$$
$$x_{42} = 70.1622361499298$$
$$x_{43} = 63.879050721003$$
$$x_{44} = 26.1799389485711$$
$$x_{45} = -59.6902604772027$$
$$x_{46} = 62.8318525722289$$
$$x_{47} = 39.7935070383395$$
$$x_{48} = 72.2566310199357$$
$$x_{49} = -79.5870139959988$$
$$x_{50} = 83.7758040068571$$
$$x_{51} = 65.97344575532$$
$$x_{52} = -57.595865420076$$
$$x_{53} = -24.085543546371$$
$$x_{54} = 21.9911485855667$$
$$x_{55} = -64.9262478936832$$
$$x_{56} = -39.7935068843454$$
$$x_{57} = -37.6991118947743$$
$$x_{58} = 87.9645943394306$$
$$x_{59} = 48.171087549349$$
$$x_{60} = 92.1533847504801$$
$$x_{61} = 17.8023584664455$$
$$x_{62} = -26.1799386039895$$
$$x_{63} = 4.18879034564693$$
$$x_{64} = 28.2743338384102$$
$$x_{65} = -15.7079633117906$$
$$x_{66} = -46.0766921317752$$
$$x_{67} = 6.28318524850749$$
$$x_{68} = 54.4542725045089$$
$$x_{69} = 46.0766922309492$$
$$x_{70} = 52.3598774106518$$
$$x_{71} = 94.247779612042$$
$$x_{72} = -13.6135682647737$$
$$x_{73} = 96.3421745768098$$
$$x_{74} = -92.1533843304102$$
$$x_{75} = -81.6814090591358$$
$$x_{76} = 12.5663707133305$$
$$x_{77} = 12.5663690482218$$
$$x_{78} = 37.6991117734004$$
$$x_{79} = -6.28318532046115$$
$$x_{80} = 90.0589893483166$$
$$x_{81} = -96.3421749004023$$
$$x_{82} = -83.775804061806$$
$$x_{83} = 30.3687288284625$$
$$x_{84} = -77.4926188107758$$
$$x_{85} = -9.42477805140116$$
$$x_{86} = 85.8701992993614$$
$$x_{87} = 100.530964970124$$
$$x_{88} = 10.4719753649727$$
$$x_{89} = -31.415926551159$$
$$x_{90} = -94.2477795332638$$
$$x_{91} = 50.2654824287478$$
$$x_{92} = 19.8967535620831$$
$$x_{93} = -65.9734457769287$$
$$x_{94} = -74.3510261761185$$
$$x_{95} = -48.1710871787495$$
$$x_{96} = 68.0678407822198$$
$$x_{97} = 78.5398164271464$$
$$x_{98} = -61.7846554735345$$
$$x_{99} = -96.3421746111554$$