El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\cot{\left(x \right)} - 4 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \operatorname{acot}{\left(4 \right)}$$
Solución numérica$$x_{1} = 44.227275813384$$
$$x_{2} = -50.0205037943098$$
$$x_{3} = 25.3777198918452$$
$$x_{4} = -46.87891114072$$
$$x_{5} = -87.7196156373873$$
$$x_{6} = 66.2184243885125$$
$$x_{7} = -59.4452817550792$$
$$x_{8} = 53.6520537741534$$
$$x_{9} = 88.2095729636411$$
$$x_{10} = 81.9263876564615$$
$$x_{11} = 37.9440905062044$$
$$x_{12} = -72.0116523694384$$
$$x_{13} = -43.7373184871302$$
$$x_{14} = 917.590033511347$$
$$x_{15} = -65.7284670622588$$
$$x_{16} = 22.2361272382554$$
$$x_{17} = -53.1620964478996$$
$$x_{18} = 59.9352390813329$$
$$x_{19} = -78.294837676618$$
$$x_{20} = -94.0028009445669$$
$$x_{21} = -6.03820664405272$$
$$x_{22} = 15.9529419310758$$
$$x_{23} = -90.8612082909771$$
$$x_{24} = -28.0293552191813$$
$$x_{25} = -21.7461699120017$$
$$x_{26} = 75.6432023492819$$