El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(- \sin{\left(2 x \right)} - \cos{\left(2 x \right)}\right) e^{- 3 x} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\pi}{8}$$
Solución numérica$$x_{1} = 90.7134878724053$$
$$x_{2} = 82.8595062384308$$
$$x_{3} = 9.03207887907065$$
$$x_{4} = 5.89048622548086$$
$$x_{5} = 37.3064127613788$$
$$x_{6} = 60.8683576633022$$
$$x_{7} = 98.5674695063798$$
$$x_{8} = 67.1515429704818$$
$$x_{9} = 54.5851723561227$$
$$x_{10} = 75.0055246044563$$
$$x_{11} = 16.8860605130451$$
$$x_{12} = 64.009950316892$$
$$x_{13} = 84.4303025652257$$
$$x_{14} = 23.1692458202247$$
$$x_{15} = 45.1603943953533$$
$$x_{16} = 42.0188017417635$$
$$x_{17} = -1.96349540849362$$
$$x_{18} = 24.7400421470196$$
$$x_{19} = 96.9966731795849$$
$$x_{20} = 38.8772090881737$$
$$x_{21} = 2.74889357189107$$
$$x_{22} = -5.10508806208341$$
$$x_{23} = 56.1559686829176$$
$$x_{24} = 81.2887099116359$$
$$x_{25} = 15.3152641862502$$
$$x_{26} = 12.1736715326604$$
$$x_{27} = -9.8174770424681$$
$$x_{28} = 10.6028752058656$$
$$x_{29} = 1.17809724509617$$
$$x_{30} = 62.4391539900971$$
$$x_{31} = 20.0276531666349$$
$$x_{32} = 95.42587685279$$
$$x_{33} = 76.5763209312512$$
$$x_{34} = -3.53429173528852$$
$$x_{35} = 34.164820107789$$
$$x_{36} = 40.4480054149686$$
$$x_{37} = 31.0232274541992$$
$$x_{38} = 100.138265833175$$
$$x_{39} = 53.0143760293278$$
$$x_{40} = 78.1471172580461$$
$$x_{41} = 4.31968989868597$$
$$x_{42} = -6.67588438887831$$
$$x_{43} = 68.7223392972767$$
$$x_{44} = 70.2931356240716$$
$$x_{45} = 73.4347282776614$$
$$x_{46} = 18.45685683984$$
$$x_{47} = 86.0010988920206$$
$$x_{48} = 46.7311907221482$$
$$x_{49} = 48.3019870489431$$
$$x_{50} = 26.3108384738145$$
$$x_{51} = 59.2975613365073$$
$$x_{52} = 92.2842841992002$$
$$x_{53} = 32.5940237809941$$
$$x_{54} = 89.1426915456104$$