El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\cot{\left(\frac{3 x}{5} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{5 \pi}{6}$$
Solución numérica$$x_{1} = 7.85398163397448$$
$$x_{2} = -81.1578102177363$$
$$x_{3} = -86.3937979737193$$
$$x_{4} = -96.8657734856853$$
$$x_{5} = -2.61799387799149$$
$$x_{6} = 23.5619449019235$$
$$x_{7} = 81.1578102177363$$
$$x_{8} = -65.4498469497874$$
$$x_{9} = -39.2699081698724$$
$$x_{10} = -60.2138591938044$$
$$x_{11} = 86.3937979737193$$
$$x_{12} = -34.0339204138894$$
$$x_{13} = -75.9218224617533$$
$$x_{14} = -18.3259571459405$$
$$x_{15} = -70.6858347057703$$
$$x_{16} = 60.2138591938044$$
$$x_{17} = 65.4498469497874$$
$$x_{18} = 13.0899693899575$$
$$x_{19} = -49.7418836818384$$
$$x_{20} = 91.6297857297023$$
$$x_{21} = 39.2699081698724$$
$$x_{22} = -13.0899693899575$$
$$x_{23} = 49.7418836818384$$
$$x_{24} = 70.6858347057703$$
$$x_{25} = 96.8657734856853$$
$$x_{26} = -7.85398163397448$$
$$x_{27} = -23.5619449019235$$
$$x_{28} = -91.6297857297023$$
$$x_{29} = 44.5058959258554$$
$$x_{30} = -44.5058959258554$$
$$x_{31} = 2.61799387799149$$
$$x_{32} = -54.9778714378214$$
$$x_{33} = 34.0339204138894$$
$$x_{34} = 54.9778714378214$$
$$x_{35} = 18.3259571459405$$
$$x_{36} = 75.9218224617533$$
$$x_{37} = -28.7979326579064$$
$$x_{38} = -102.101761241668$$
$$x_{39} = 28.7979326579064$$
$$x_{40} = 102.101761241668$$