El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\tan^{6}{\left(x \right)} \tan{\left(3 x - 3 \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = 1$$
$$x_{3} = \pi$$
$$x_{4} = - i \log{\left(- \frac{\left(1 - \sqrt{3} i\right) e^{i}}{2} \right)}$$
$$x_{5} = - i \log{\left(\frac{\left(1 - \sqrt{3} i\right) e^{i}}{2} \right)}$$
$$x_{6} = - i \log{\left(- \frac{\left(1 + \sqrt{3} i\right) e^{i}}{2} \right)}$$
$$x_{7} = - i \log{\left(\frac{\left(1 + \sqrt{3} i\right) e^{i}}{2} \right)}$$
$$x_{8} = - i \log{\left(- e^{i} \right)}$$
Solución numérica$$x_{1} = -59.7374579694027$$
$$x_{2} = 15.7209862278475$$
$$x_{3} = -2.14159265358979$$
$$x_{4} = 65.974252409946$$
$$x_{5} = 31.4290291258414$$
$$x_{6} = 87.9656934373435$$
$$x_{7} = -43.9827453287542$$
$$x_{8} = -52.4070751110265$$
$$x_{9} = -79.634211442138$$
$$x_{10} = 84.7758040957278$$
$$x_{11} = 19.8495559215388$$
$$x_{12} = 56.5014702134197$$
$$x_{13} = -24.1327412287183$$
$$x_{14} = -6.27074161360591$$
$$x_{15} = -53.4542726622231$$
$$x_{16} = -18.8967534727904$$
$$x_{17} = -68.1150383789755$$
$$x_{18} = -50.2541295186565$$
$$x_{19} = 69.0678408277789$$
$$x_{20} = -40.8879028730276$$
$$x_{21} = -37.7463093942741$$
$$x_{22} = 58.5958653158129$$
$$x_{23} = 25.0855436775217$$
$$x_{24} = 50.2651317602012$$
$$x_{25} = -3.18879020571247$$
$$x_{26} = 21.9914036428706$$
$$x_{27} = -13.6607657167524$$
$$x_{28} = -75.4454212373516$$
$$x_{29} = -72.2457948349004$$
$$x_{30} = -94.2374438179487$$
$$x_{31} = -15.7551608191456$$
$$x_{32} = 0$$
$$x_{33} = 14.6135681655558$$
$$x_{34} = 78.4926187885482$$
$$x_{35} = -97.4365698124802$$
$$x_{36} = 91.0589894029074$$
$$x_{37} = -62.8790815903625$$
$$x_{38} = 43.9828219236108$$
$$x_{39} = -46.1238898038469$$
$$x_{40} = 6.28257246192937$$
$$x_{41} = -31.4631240870945$$
$$x_{42} = -81.7286065445312$$
$$x_{43} = 72.2564730413079$$
$$x_{44} = 36.6047167406843$$
$$x_{45} = -28.262445901225$$
$$x_{46} = -21.991385202368$$
$$x_{47} = 85.8230016469244$$
$$x_{48} = 94.2478346295784$$
$$x_{49} = 3.0943951023932$$
$$x_{50} = 80.5870138909414$$
$$x_{51} = 47.0766922526503$$
$$x_{52} = 52.3126800086333$$
$$x_{53} = -65.974066068503$$
$$x_{54} = 100.483767363677$$
$$x_{55} = -9.47197551196598$$
$$x_{56} = 34.5103216382911$$
$$x_{57} = -35.6519142918809$$
$$x_{58} = 28.2738208481475$$
$$x_{59} = 18.8023583703422$$
$$x_{60} = 91.1178146078228$$
$$x_{61} = 41.8407044966673$$
$$x_{62} = 37.7127411788932$$
$$x_{63} = -30.4159265358979$$
$$x_{64} = -87.9652852846608$$
$$x_{65} = -57.6430628670095$$
$$x_{66} = 8.33038285837618$$
$$x_{67} = 30.3215314335047$$
$$x_{68} = -84.870199198121$$
$$x_{69} = -74.398223686155$$
$$x_{70} = 74.3038285837618$$
$$x_{71} = 12.5191730631626$$
$$x_{72} = -90.106186954104$$
$$x_{73} = 63.8318530717959$$
$$x_{74} = -96.3893722612836$$
$$x_{75} = 96.2949771588904$$