Para hallar los extremos hay que resolver la ecuación
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
$$\frac{d}{d x} f{\left(x \right)} = $$
primera derivada$$- \frac{x \sin{\left(x \right)}}{\left(1 - \cos{\left(x \right)}\right)^{2}} + \frac{1}{1 - \cos{\left(x \right)}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -78.5143446648172$$
$$x_{2} = -21.8998872970823$$
$$x_{3} = -15.5797675022891$$
$$x_{4} = -59.656738426191$$
$$x_{5} = -97.3688325296866$$
$$x_{6} = -2.33112237041442$$
$$x_{7} = -40.7916847146183$$
$$x_{8} = 78.5143446648172$$
$$x_{9} = 40.7916847146183$$
$$x_{10} = -47.0814165846103$$
$$x_{11} = -84.7994176724893$$
$$x_{12} = -65.943118880897$$
$$x_{13} = 21.8998872970823$$
$$x_{14} = -53.3696049818501$$
$$x_{15} = 59.656738426191$$
$$x_{16} = 65.943118880897$$
$$x_{17} = -9.20843355440115$$
$$x_{18} = 91.0842301384618$$
$$x_{19} = 34.4995636692158$$
$$x_{20} = 47.0814165846103$$
$$x_{21} = 28.2034502671317$$
$$x_{22} = -91.0842301384618$$
$$x_{23} = 2.33112237041442$$
$$x_{24} = -28.2034502671317$$
$$x_{25} = -34.4995636692158$$
$$x_{26} = 72.2289430706097$$
$$x_{27} = 9.20843355440115$$
$$x_{28} = -72.2289430706097$$
$$x_{29} = 84.7994176724893$$
$$x_{30} = 15.5797675022891$$
$$x_{31} = 53.3696049818501$$
$$x_{32} = 97.3688325296866$$
Signos de extremos en los puntos:
(-78.51434466481717, -39.2635405954583)
(-21.89988729708232, -10.9727748162644)
(-15.579767502289146, -7.821976656249)
(-59.65673842619101, -29.836750495968)
(-97.36883252968656, -48.6895513782775)
(-2.331122370414423, -1.3800501396893)
(-40.791684714618334, -20.4080997574018)
(78.51434466481717, 39.2635405954583)
(40.791684714618334, 20.4080997574018)
(-47.0814165846103, -23.5513281936648)
(-84.79941767248933, -42.4056051031498)
(-65.94311888089696, -32.9791417327101)
(21.89988729708232, 10.9727748162644)
(-53.36960498185014, -26.6941711193826)
(59.65673842619101, 29.836750495968)
(65.94311888089696, 32.9791417327101)
(-9.208433554401154, -4.65851482876886)
(91.0842301384618, 45.5476044936817)
(34.49956366921579, 17.2642747715272)
(47.0814165846103, 23.5513281936648)
(28.203450267131746, 14.1194534609607)
(-91.0842301384618, -45.5476044936817)
(2.331122370414423, 1.3800501396893)
(-28.203450267131746, -14.1194534609607)
(-34.49956366921579, -17.2642747715272)
(72.2289430706097, 36.1213939680409)
(9.208433554401154, 4.65851482876886)
(-72.2289430706097, -36.1213939680409)
(84.79941767248933, 42.4056051031498)
(15.579767502289146, 7.821976656249)
(53.36960498185014, 26.6941711193826)
(97.36883252968656, 48.6895513782775)
Intervalos de crecimiento y decrecimiento de la función:Hallemos los intervalos donde la función crece y decrece y también los puntos mínimos y máximos de la función, para lo cual miramos cómo se comporta la función en los extremos con desviación mínima del extremo:
Puntos mínimos de la función:
$$x_{1} = 78.5143446648172$$
$$x_{2} = 40.7916847146183$$
$$x_{3} = 21.8998872970823$$
$$x_{4} = 59.656738426191$$
$$x_{5} = 65.943118880897$$
$$x_{6} = 91.0842301384618$$
$$x_{7} = 34.4995636692158$$
$$x_{8} = 47.0814165846103$$
$$x_{9} = 28.2034502671317$$
$$x_{10} = 2.33112237041442$$
$$x_{11} = 72.2289430706097$$
$$x_{12} = 9.20843355440115$$
$$x_{13} = 84.7994176724893$$
$$x_{14} = 15.5797675022891$$
$$x_{15} = 53.3696049818501$$
$$x_{16} = 97.3688325296866$$
Puntos máximos de la función:
$$x_{16} = -78.5143446648172$$
$$x_{16} = -21.8998872970823$$
$$x_{16} = -15.5797675022891$$
$$x_{16} = -59.656738426191$$
$$x_{16} = -97.3688325296866$$
$$x_{16} = -2.33112237041442$$
$$x_{16} = -40.7916847146183$$
$$x_{16} = -47.0814165846103$$
$$x_{16} = -84.7994176724893$$
$$x_{16} = -65.943118880897$$
$$x_{16} = -53.3696049818501$$
$$x_{16} = -9.20843355440115$$
$$x_{16} = -91.0842301384618$$
$$x_{16} = -28.2034502671317$$
$$x_{16} = -34.4995636692158$$
$$x_{16} = -72.2289430706097$$
Decrece en los intervalos
$$\left[97.3688325296866, \infty\right)$$
Crece en los intervalos
$$\left[-2.33112237041442, 2.33112237041442\right]$$