El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\cot{\left(x \right)} + 3 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \operatorname{acot}{\left(3 \right)}$$
Solución numérica$$x_{1} = 1061.53656635895$$
$$x_{2} = 100.209214360477$$
$$x_{3} = 2.81984209919315$$
$$x_{4} = 46.8021392494503$$
$$x_{5} = -31.7376770902946$$
$$x_{6} = 40.5189539422707$$
$$x_{7} = -50.5872330118333$$
$$x_{8} = -97.7111228156802$$
$$x_{9} = 43.6605465958605$$
$$x_{10} = -69.4367889333721$$
$$x_{11} = -6.60493586157623$$
$$x_{12} = -100.85271546927$$
$$x_{13} = 12.2446200599625$$
$$x_{14} = -25.454491783115$$
$$x_{15} = -53.7288256654231$$
$$x_{16} = 5.96143475278294$$
$$x_{17} = -16.0297138223456$$
$$x_{18} = 84.5012510925278$$
$$x_{19} = -60.0120109726027$$
$$x_{20} = -38.0208623974742$$
$$x_{21} = 31.0941759815013$$
$$x_{22} = 71.9348804781686$$
$$x_{23} = 56.2269172102196$$
$$x_{24} = -82.0031595477313$$
$$x_{25} = -47.4456403582435$$
$$x_{26} = -3.46334320798644$$
$$x_{27} = -94.5695301620904$$
$$x_{28} = 27.9525833279115$$
$$x_{29} = -9.74652851516602$$
$$x_{30} = -41.162455051064$$
$$x_{31} = 112.775584974836$$
$$x_{32} = 34.2357686350911$$
$$x_{33} = -75.7199742405517$$
$$x_{34} = -166.826161194656$$
$$x_{35} = -107.13590077645$$
$$x_{36} = 78.2180657853482$$
$$x_{37} = 93.9260290532972$$
$$x_{38} = 62.5101025173992$$
$$x_{39} = 49.9437319030401$$