El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(- \sin{\left(\frac{\sqrt{31} x}{2} \right)} - \cos{\left(\frac{\sqrt{31} x}{2} \right)}\right) e^{\frac{3 x}{2}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\sqrt{31} \pi}{62}$$
Solución numérica$$x_{1} = -3.6676035330551$$
$$x_{2} = -60.0922732723643$$
$$x_{3} = -99.5895420898807$$
$$x_{4} = -57.8352864827919$$
$$x_{5} = 14.3882907835238$$
$$x_{6} = -47.6788459297163$$
$$x_{7} = 6.48883702002056$$
$$x_{8} = 9.87431720437911$$
$$x_{9} = -99.5853382794356$$
$$x_{10} = -54.4498062984334$$
$$x_{11} = -40.9078855609992$$
$$x_{12} = -13.8240440861308$$
$$x_{13} = -80.4051543785156$$
$$x_{14} = -93.9470751159498$$
$$x_{15} = -86.0476213524465$$
$$x_{16} = -44.2933657453577$$
$$x_{17} = 15.51678417831$$
$$x_{18} = -16.0810308757031$$
$$x_{19} = -98.4610486950946$$
$$x_{20} = -82.662141168088$$
$$x_{21} = -0.282123348696546$$
$$x_{22} = -5.92459032262747$$
$$x_{23} = 7.61733041480674$$
$$x_{24} = -36.3939119818544$$
$$x_{25} = -34.1369251922821$$
$$x_{26} = -8.18157711219983$$
$$x_{27} = 12.1313039939515$$
$$x_{28} = -52.192819508861$$
$$x_{29} = -91.6900883263774$$
$$x_{30} = -26.7369873976769$$
$$x_{31} = -23.9804846392064$$
$$x_{32} = -67.9917270358676$$
$$x_{33} = -65.7347402462952$$
$$x_{34} = -29.6229516131373$$
$$x_{35} = -31.8799384027097$$
$$x_{36} = -96.2040619055222$$
$$x_{37} = 4.23185023044819$$
$$x_{38} = -88.3046081420189$$
$$x_{39} = 20.0307577574548$$
$$x_{40} = -78.1481675889433$$
$$x_{41} = -62.3492600619367$$
$$x_{42} = -10.4385639017722$$
$$x_{43} = -11.5670572965584$$
$$x_{44} = -39.779392166213$$
$$x_{45} = -55.5782996932196$$
$$x_{46} = -21.723497849634$$
$$x_{47} = -75.8911807993709$$
$$x_{48} = 1.97486344087582$$
$$x_{49} = -72.5057006150123$$
$$x_{50} = -18.3380176652755$$
$$x_{51} = -28.4944582183511$$
$$x_{52} = -73.6341940097985$$
$$x_{53} = -83.7906345628742$$
$$x_{54} = -42.0363789557854$$
$$x_{55} = -27.365964823565$$
$$x_{56} = -70.24871382544$$
$$x_{57} = -49.9358327192886$$
$$x_{58} = 17.7737709678824$$