Hallemos los puntos de flexiones, para eso hay que resolver la ecuación
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = 0$$
(la segunda derivada es igual a cero),
las raíces de la ecuación obtenida serán los puntos de flexión para el gráfico de la función indicado:
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = $$
segunda derivada$$2 x \left(x^{2} \left(\cot^{2}{\left(x \right)} + 1\right) \cot{\left(x \right)} - 3 x \left(\cot^{2}{\left(x \right)} + 1\right) + 3 \cot{\left(x \right)}\right) = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -32.8960260050293$$
$$x_{2} = -51.7784686744238$$
$$x_{3} = 7.48842693978149$$
$$x_{4} = 0.679249465840815$$
$$x_{5} = 29.7449466925285$$
$$x_{6} = -26.5916600509418$$
$$x_{7} = -95.7872769864248$$
$$x_{8} = 70.6434188275575$$
$$x_{9} = -0.679249465840815$$
$$x_{10} = 89.5018968492468$$
$$x_{11} = 17.1068332728208$$
$$x_{12} = -89.5018968492468$$
$$x_{13} = 4.13955655464989$$
$$x_{14} = 20.2744761824037$$
$$x_{15} = 67.4998558719416$$
$$x_{16} = -73.7868143863902$$
$$x_{17} = -48.6331554374036$$
$$x_{18} = 51.7784686744238$$
$$x_{19} = -45.4873310871777$$
$$x_{20} = -17.1068332728208$$
$$x_{21} = -67.4998558719416$$
$$x_{22} = -10.7290749998442$$
$$x_{23} = -83.2161858173104$$
$$x_{24} = -98.929862639562$$
$$x_{25} = 95.7872769864248$$
$$x_{26} = 83.2161858173104$$
$$x_{27} = 48.6331554374036$$
$$x_{28} = 92.6446240794201$$
$$x_{29} = 86.3590872002657$$
$$x_{30} = -80.0731819271742$$
$$x_{31} = 45.4873310871777$$
$$x_{32} = 10.7290749998442$$
$$x_{33} = 98.929862639562$$
$$x_{34} = 73.7868143863902$$
$$x_{35} = -20.2744761824037$$
$$x_{36} = 39.1936616083609$$
$$x_{37} = -58.0678920018836$$
$$x_{38} = 26.5916600509418$$
$$x_{39} = 80.0731819271742$$
$$x_{40} = 61.2121250520621$$
$$x_{41} = -54.9233580387911$$
$$x_{42} = -64.35610108832$$
$$x_{43} = 42.340882720973$$
$$x_{44} = -86.3590872002657$$
$$x_{45} = -13.9280186150476$$
$$x_{46} = -23.435298767555$$
$$x_{47} = 13.9280186150476$$
$$x_{48} = 58.0678920018836$$
$$x_{49} = -7.48842693978149$$
$$x_{50} = -4.13955655464989$$
$$x_{51} = -76.9300630018709$$
$$x_{52} = -61.2121250520621$$
$$x_{53} = -70.6434188275575$$
$$x_{54} = -92.6446240794201$$
$$x_{55} = 32.8960260050293$$
$$x_{56} = -29.7449466925285$$
$$x_{57} = 36.0454677896424$$
$$x_{58} = 76.9300630018709$$
$$x_{59} = -39.1936616083609$$
$$x_{60} = -36.0454677896424$$
$$x_{61} = 64.35610108832$$
$$x_{62} = 54.9233580387911$$
$$x_{63} = -42.340882720973$$
$$x_{64} = 23.435298767555$$
Intervalos de convexidad y concavidad:Hallemos los intervales donde la función es convexa o cóncava, para eso veamos cómo se comporta la función en los puntos de flexiones:
Cóncava en los intervalos
$$\left[-0.679249465840815, 0.679249465840815\right]$$
Convexa en los intervalos
$$\left(-\infty, -98.929862639562\right]$$