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$$- \frac{2 x \cos{\left(x \right)}}{\left(x^{2} - 1\right)^{2}} - \frac{\sin{\left(x \right)}}{x^{2} - 1} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 12.4054996335861$$
$$x_{2} = -100.511067265113$$
$$x_{3} = -81.6569174978428$$
$$x_{4} = -2.33112237041442$$
$$x_{5} = -28.2034502671317$$
$$x_{6} = 87.941852980689$$
$$x_{7} = -84.7994176724893$$
$$x_{8} = -43.9367850637406$$
$$x_{9} = -37.6459978360151$$
$$x_{10} = 34.4995636692158$$
$$x_{11} = 65.943118880897$$
$$x_{12} = -34.4995636692158$$
$$x_{13} = 18.7429502117119$$
$$x_{14} = 5.95017264337656$$
$$x_{15} = -31.3521566903887$$
$$x_{16} = 84.7994176724893$$
$$x_{17} = 97.3688325296866$$
$$x_{18} = -21.8998872970823$$
$$x_{19} = -9.20843355440115$$
$$x_{20} = 75.3716900810604$$
$$x_{21} = 56.5132815466599$$
$$x_{22} = -53.3696049818501$$
$$x_{23} = -40.7916847146183$$
$$x_{24} = 50.2256674407532$$
$$x_{25} = -97.3688325296866$$
$$x_{26} = 81.6569174978428$$
$$x_{27} = 91.0842301384618$$
$$x_{28} = -18.7429502117119$$
$$x_{29} = 2.33112237041442$$
$$x_{30} = 100.511067265113$$
$$x_{31} = -50.2256674407532$$
$$x_{32} = -91.0842301384618$$
$$x_{33} = 37.6459978360151$$
$$x_{34} = -65.943118880897$$
$$x_{35} = 125.647788969162$$
$$x_{36} = 25.0529526753384$$
$$x_{37} = -103.653263067797$$
$$x_{38} = 131.93173238582$$
$$x_{39} = -87.941852980689$$
$$x_{40} = 47.0814165846103$$
$$x_{41} = 94.2265549654551$$
$$x_{42} = -75.3716900810604$$
$$x_{43} = -47.0814165846103$$
$$x_{44} = -78.5143446648172$$
$$x_{45} = 78.5143446648172$$
$$x_{46} = 59.656738426191$$
$$x_{47} = -94.2265549654551$$
$$x_{48} = 40.7916847146183$$
$$x_{49} = 31.3521566903887$$
$$x_{50} = -15.5797675022891$$
$$x_{51} = -12.4054996335861$$
$$x_{52} = -5.95017264337656$$
$$x_{53} = 72.2289430706097$$
$$x_{54} = 15.5797675022891$$
$$x_{55} = 28.2034502671317$$
$$x_{56} = 21.8998872970823$$
$$x_{57} = 43.9367850637406$$
$$x_{58} = -72.2289430706097$$
$$x_{59} = -62.8000086337252$$
$$x_{60} = 62.8000086337252$$
$$x_{61} = -69.086091013299$$
$$x_{62} = -25.0529526753384$$
$$x_{63} = 69.086091013299$$
$$x_{64} = -59.656738426191$$
$$x_{65} = 9.20843355440115$$
$$x_{66} = -56.5132815466599$$
$$x_{67} = 0$$
$$x_{68} = 53.3696049818501$$
Signos de extremos en los puntos:
(12.405499633586086, 0.00645592708029144)
(-100.51106726511297, 9.89758509183166e-5)
(-81.6569174978428, 0.000149950842172114)
(-2.331122370414423, -0.155421131677418)
(-28.203450267131746, -0.00125559586593523)
(87.94185298068903, 0.000129286334811403)
(-84.79941767248933, -0.00013904451760157)
(-43.936785063740594, 0.000517748125715798)
(-37.645997836015106, 0.000705108648137029)
(34.49956366921579, -0.000839475570857111)
(65.94311888089696, -0.000229911752195002)
(-34.49956366921579, -0.000839475570857111)
(18.742950211711907, 0.00283850456596173)
(5.9501726433765585, 0.0274690904508921)
(-31.352156690388735, 0.0010163038211767)
(84.79941767248933, -0.00013904451760157)
(97.36883252968656, -0.000105466435587997)
(-21.89988729708232, -0.00208071049534438)
(-9.208433554401154, -0.0116556571276676)
(75.37169008106044, 0.000175997723793477)
(56.51328154665989, 0.000313013440723007)
(-53.36960498185014, -0.000350961579426066)
(-40.791684714618334, -0.000600614473584034)
(50.22566744075319, 0.000396256537564922)
(-97.36883252968656, -0.000105466435587997)
(81.6569174978428, 0.000149950842172114)
(91.0842301384618, -0.000120520596237142)
(-18.742950211711907, 0.00283850456596173)
(2.331122370414423, -0.155421131677418)
(100.51106726511297, 9.89758509183166e-5)
(-50.22566744075319, 0.000396256537564922)
(-91.0842301384618, -0.000120520596237142)
(37.645997836015106, 0.000705108648137029)
(-65.94311888089696, -0.000229911752195002)
(125.64778896916187, 6.33377731879486e-5)
(25.0529526753384, 0.0015907091444567)
(-103.65326306779691, -9.30665517191495e-5)
(131.93173238582048, 5.74482124130948e-5)
(-87.94185298068903, 0.000129286334811403)
(47.0814165846103, -0.000450925793751296)
(94.22655496545507, 0.000112617131747143)
(-75.37169008106044, 0.000175997723793477)
(-47.0814165846103, -0.000450925793751296)
(-78.51434466481717, -0.000162192786313112)
(78.51434466481717, -0.000162192786313112)
(59.65673842619101, -0.000280904680743359)
(-94.22655496545507, 0.000112617131747143)
(40.791684714618334, -0.000600614473584034)
(31.352156690388735, 0.0010163038211767)
(-15.579767502289146, -0.00410291496827567)
(-12.405499633586086, 0.00645592708029144)
(-5.9501726433765585, 0.0274690904508921)
(72.2289430706097, -0.000191643565642655)
(15.579767502289146, -0.00410291496827567)
(28.203450267131746, -0.00125559586593523)
(21.89988729708232, -0.00208071049534438)
(43.936785063740594, 0.000517748125715798)
(-72.2289430706097, -0.000191643565642655)
(-62.80000863372525, 0.000253495636099399)
(62.80000863372525, 0.000253495636099399)
(-69.08609101329898, 0.000209472866973509)
(-25.0529526753384, 0.0015907091444567)
(69.08609101329898, 0.000209472866973509)
(-59.65673842619101, -0.000280904680743359)
(9.208433554401154, -0.0116556571276676)
(-56.51328154665989, 0.000313013440723007)
(0, -1)
(53.36960498185014, -0.000350961579426066)
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:
$$x_{1} = -2.33112237041442$$
$$x_{2} = -28.2034502671317$$
$$x_{3} = -84.7994176724893$$
$$x_{4} = 34.4995636692158$$
$$x_{5} = 65.943118880897$$
$$x_{6} = -34.4995636692158$$
$$x_{7} = 84.7994176724893$$
$$x_{8} = 97.3688325296866$$
$$x_{9} = -21.8998872970823$$
$$x_{10} = -9.20843355440115$$
$$x_{11} = -53.3696049818501$$
$$x_{12} = -40.7916847146183$$
$$x_{13} = -97.3688325296866$$
$$x_{14} = 91.0842301384618$$
$$x_{15} = 2.33112237041442$$
$$x_{16} = -91.0842301384618$$
$$x_{17} = -65.943118880897$$
$$x_{18} = -103.653263067797$$
$$x_{19} = 47.0814165846103$$
$$x_{20} = -47.0814165846103$$
$$x_{21} = -78.5143446648172$$
$$x_{22} = 78.5143446648172$$
$$x_{23} = 59.656738426191$$
$$x_{24} = 40.7916847146183$$
$$x_{25} = -15.5797675022891$$
$$x_{26} = 72.2289430706097$$
$$x_{27} = 15.5797675022891$$
$$x_{28} = 28.2034502671317$$
$$x_{29} = 21.8998872970823$$
$$x_{30} = -72.2289430706097$$
$$x_{31} = -59.656738426191$$
$$x_{32} = 9.20843355440115$$
$$x_{33} = 53.3696049818501$$
Puntos máximos de la función:
$$x_{33} = 12.4054996335861$$
$$x_{33} = -100.511067265113$$
$$x_{33} = -81.6569174978428$$
$$x_{33} = 87.941852980689$$
$$x_{33} = -43.9367850637406$$
$$x_{33} = -37.6459978360151$$
$$x_{33} = 18.7429502117119$$
$$x_{33} = 5.95017264337656$$
$$x_{33} = -31.3521566903887$$
$$x_{33} = 75.3716900810604$$
$$x_{33} = 56.5132815466599$$
$$x_{33} = 50.2256674407532$$
$$x_{33} = 81.6569174978428$$
$$x_{33} = -18.7429502117119$$
$$x_{33} = 100.511067265113$$
$$x_{33} = -50.2256674407532$$
$$x_{33} = 37.6459978360151$$
$$x_{33} = 125.647788969162$$
$$x_{33} = 25.0529526753384$$
$$x_{33} = 131.93173238582$$
$$x_{33} = -87.941852980689$$
$$x_{33} = 94.2265549654551$$
$$x_{33} = -75.3716900810604$$
$$x_{33} = -94.2265549654551$$
$$x_{33} = 31.3521566903887$$
$$x_{33} = -12.4054996335861$$
$$x_{33} = -5.95017264337656$$
$$x_{33} = 43.9367850637406$$
$$x_{33} = -62.8000086337252$$
$$x_{33} = 62.8000086337252$$
$$x_{33} = -69.086091013299$$
$$x_{33} = -25.0529526753384$$
$$x_{33} = 69.086091013299$$
$$x_{33} = -56.5132815466599$$
$$x_{33} = 0$$
Decrece en los intervalos
$$\left[97.3688325296866, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -103.653263067797\right]$$