El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\tan{\left(7 x \right)} \cot{\left(2 x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = -11.7809724509617$$
$$x_{2} = -38.484510006475$$
$$x_{3} = -89.7597901025655$$
$$x_{4} = 64.6270488738472$$
$$x_{5} = -49.8166835069239$$
$$x_{6} = -23.7863443771799$$
$$x_{7} = 36.9137136796801$$
$$x_{8} = 8.0783811092309$$
$$x_{9} = -31.8647254864108$$
$$x_{10} = -45.7774929523084$$
$$x_{11} = 2.24399475256414$$
$$x_{12} = -48.0214877048726$$
$$x_{13} = 12.1175716638463$$
$$x_{14} = -58.7926625171804$$
$$x_{15} = -85.7205995479501$$
$$x_{16} = 54.3046730120521$$
$$x_{17} = -70.0126362800011$$
$$x_{18} = -46.2262919028212$$
$$x_{19} = 80.3350121417961$$
$$x_{20} = 39.9431065956417$$
$$x_{21} = -92.0037848551297$$
$$x_{22} = -62.0464549083984$$
$$x_{23} = 26.030339129744$$
$$x_{24} = -4.03919055461545$$
$$x_{25} = 83.9254037458988$$
$$x_{26} = -33.7721210260903$$
$$x_{27} = -13.9127674658977$$
$$x_{28} = 76.2958215871807$$
$$x_{29} = -52.060678259488$$
$$x_{30} = -97.8381712117964$$
$$x_{31} = 38.1479107935903$$
$$x_{32} = -17.9519580205131$$
$$x_{33} = 10.322375861795$$
$$x_{34} = 52.060678259488$$
$$x_{35} = 35.4551170905134$$
$$x_{36} = 96.0429754097451$$
$$x_{37} = 73.1542289335909$$
$$x_{38} = 100.082165964361$$
$$x_{39} = 70.0126362800011$$
$$x_{40} = 24.2351433276927$$
$$x_{41} = 20.1959527730772$$
$$x_{42} = -79.8862131912833$$
$$x_{43} = 68.2174404779498$$
$$x_{44} = -1.79519580205131$$
$$x_{45} = 8.63937979737193$$
$$x_{46} = -22.4399475256414$$
$$x_{47} = 21.5423496246157$$
$$x_{48} = 48.0214877048726$$
$$x_{49} = -71.8078320820524$$
$$x_{50} = 90.2085890530783$$
$$x_{51} = 17.9519580205131$$
$$x_{52} = -79.4374142407705$$
$$x_{53} = 38.484510006475$$
$$x_{54} = 4.03919055461545$$
$$x_{55} = -9.87357691128221$$
$$x_{56} = 98.2869701623092$$
$$x_{57} = 30.0695296843594$$
$$x_{58} = -39.9431065956417$$
$$x_{59} = 61.9342551707702$$
$$x_{60} = -83.9254037458988$$
$$x_{61} = 50.7142814079495$$
$$x_{62} = 34.1087202389749$$
$$x_{63} = 82.1302079438475$$
$$x_{64} = -55.7632696012188$$
$$x_{65} = 32.3135244369236$$
$$x_{66} = -63.7294509728215$$
$$x_{67} = -27.8255349317953$$
$$x_{68} = -93.798980657181$$
$$x_{69} = 78.091017389232$$
$$x_{70} = 42.1871013482058$$
$$x_{71} = -77.7544181763474$$
$$x_{72} = -53.8558740615393$$
$$x_{73} = -35.9039160410262$$
$$x_{74} = -5.83438635666676$$
$$x_{75} = -74.0518268346165$$
$$x_{76} = 86.1693984984629$$
$$x_{77} = 60.1390593687189$$
$$x_{78} = 92.0037848551297$$
$$x_{79} = 59.2414614676932$$
$$x_{80} = 16.1567622184618$$
$$x_{81} = -30.0695296843594$$
$$x_{82} = -65.07584782436$$
$$x_{83} = -75.8470226366679$$
$$x_{84} = -96.0429754097451$$
$$x_{85} = -41.738302397693$$
$$x_{86} = -26.030339129744$$
$$x_{87} = -8.0783811092309$$
$$x_{88} = -87.5157953500014$$
$$x_{89} = 93.4623814442964$$
$$x_{90} = 56.0998688141035$$
$$x_{91} = 46.2262919028212$$
$$x_{92} = -99.7455667514759$$
$$x_{93} = -19.7471538225644$$
$$x_{94} = 74.0518268346165$$
$$x_{95} = -67.768641527437$$
$$x_{96} = 64.1782499233343$$
$$x_{97} = -57.8950646161548$$