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$$\frac{\cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x} + \frac{\cos{\left(x \right)}}{x^{2}} + \frac{1}{x^{2}}}{x} - \frac{\left(- \frac{\cos{\left(x \right)}}{x} - \frac{1}{x}\right) + \sin{\left(x \right)}}{x^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -26.7063338692132$$
$$x_{2} = -98.9599644038221$$
$$x_{3} = -73.8270605507521$$
$$x_{4} = -7.88515116887855$$
$$x_{5} = 67.5438038559559$$
$$x_{6} = 80.1103011235726$$
$$x_{7} = -76.9693574926784$$
$$x_{8} = 98.9599644038221$$
$$x_{9} = 26.7063338692132$$
$$x_{10} = -14.1470612675535$$
$$x_{11} = -32.9885573139218$$
$$x_{12} = 7.88515116887855$$
$$x_{13} = 14.1470612675535$$
$$x_{14} = 54.9772101700572$$
$$x_{15} = -36.1267854631135$$
$$x_{16} = -45.5540563247426$$
$$x_{17} = -1.92814221248582$$
$$x_{18} = -17.2721001030608$$
$$x_{19} = -42.4103901077775$$
$$x_{20} = -92.6767504785877$$
$$x_{21} = 32.9885573139218$$
$$x_{22} = -67.5438038559559$$
$$x_{23} = -54.9772101700572$$
$$x_{24} = 73.8270605507521$$
$$x_{25} = -86.3935300869876$$
$$x_{26} = 42.4103901077775$$
$$x_{27} = -89.5356400464507$$
$$x_{28} = -83.2524937964679$$
$$x_{29} = 23.5583542044893$$
$$x_{30} = 61.2605241007865$$
$$x_{31} = 1302.19015609242$$
$$x_{32} = -64.4031313538059$$
$$x_{33} = -934.623812153386$$
$$x_{34} = 86.3935300869876$$
$$x_{35} = -70.6862348223115$$
$$x_{36} = -20.4251234219363$$
$$x_{37} = 45.5540563247426$$
$$x_{38} = 51.8370225339475$$
$$x_{39} = -51.8370225339475$$
$$x_{40} = -61.2605241007865$$
$$x_{41} = 39.2712033162649$$
$$x_{42} = -29.8428895570452$$
$$x_{43} = -58.1200558177705$$
$$x_{44} = 4.62684260763255$$
$$x_{45} = -300.022076199367$$
$$x_{46} = 64.4031313538059$$
$$x_{47} = 108.38511677127$$
$$x_{48} = -80.1103011235726$$
$$x_{49} = 58.1200558177705$$
$$x_{50} = -95.8187937225186$$
$$x_{51} = 76.9693574926784$$
$$x_{52} = 95.8187937225186$$
$$x_{53} = -249.756583899011$$
$$x_{54} = -23.5583542044893$$
$$x_{55} = 158.650508459697$$
$$x_{56} = 29.8428895570452$$
$$x_{57} = 48.6938433476388$$
$$x_{58} = 1.92814221248582$$
$$x_{59} = 83.2524937964679$$
$$x_{60} = -48.6938433476388$$
$$x_{61} = -4.62684260763255$$
$$x_{62} = 92.6767504785877$$
$$x_{63} = 89.5356400464507$$
$$x_{64} = 36.1267854631135$$
$$x_{65} = 10.979252893657$$
$$x_{66} = -39.2712033162649$$
$$x_{67} = 17.2721001030608$$
$$x_{68} = 70.6862348223115$$
$$x_{69} = -623.606146880461$$
$$x_{70} = -10.979252893657$$
$$x_{71} = 20.4251234219363$$
Signos de extremos en los puntos:
(-26.706333869213204, 0.0360459994268291)
(-98.95996440382213, -0.010207188518506)
(-73.82706055075212, -0.0137285722270212)
(-7.885151168878552, 0.111176805721797)
(67.54380385595594, -0.0150243037185957)
(80.11030112357257, -0.0126385600543767)
(-76.96935749267844, 0.0128234426857385)
(98.95996440382213, -0.010207188518506)
(26.706333869213204, 0.0360459994268291)
(-14.147061267553491, 0.0657355160207967)
(-32.9885573139218, 0.0293962653590479)
(7.885151168878552, 0.111176805721797)
(14.147061267553491, 0.0657355160207967)
(54.977210170057226, -0.0185199850140197)
(-36.12678546311355, -0.0284452866980815)
(-45.55405632474259, 0.0214705080029265)
(-1.9281422124858159, 0.310976551731524)
(-17.272100103060776, -0.0612252764721718)
(-42.410390107777516, -0.0241344707854544)
(-92.67675047858768, -0.0109065936002076)
(32.9885573139218, 0.0293962653590479)
(-67.54380385595594, -0.0150243037185957)
(-54.977210170057226, -0.0185199850140197)
(73.82706055075212, -0.0137285722270212)
(-86.39353008698758, -0.0117088837922247)
(42.410390107777516, -0.0241344707854544)
(-89.53564004645072, 0.0110440269065513)
(-83.2524937964679, 0.011867413529818)
(23.558354204489298, -0.0442428581604881)
(61.26052410078646, -0.0165900456152065)
(1302.1901560924223, 0.000767347272002868)
(-64.40313135380586, 0.0152862159223257)
(-934.6238121533861, -0.00107109398854395)
(86.39353008698758, -0.0117088837922247)
(-70.68623482231149, 0.013946966575841)
(-20.42512342193631, 0.0465731774705954)
(45.55405632474259, 0.0214705080029265)
(51.83702253394753, 0.0189193513026445)
(-51.83702253394753, 0.0189193513026445)
(-61.26052410078646, -0.0165900456152065)
(39.27120331626491, 0.0248163567056283)
(-29.842889557045183, -0.0346290604915495)
(-58.12005581777055, 0.0169098984436123)
(4.626842607632548, -0.258060787207482)
(-300.0220761993669, -0.00334419728863768)
(64.40313135380586, 0.0152862159223257)
(108.3851167712697, 0.00914124767807342)
(-80.11030112357257, -0.0126385600543767)
(58.12005581777055, 0.0169098984436123)
(-95.8187937225186, 0.0103274717283076)
(76.96935749267844, 0.0128234426857385)
(95.8187937225186, 0.0103274717283076)
(-249.75658389901088, -0.00401992914018596)
(-23.558354204489298, -0.0442428581604881)
(158.65050845969654, 0.00626343618052408)
(29.842889557045183, -0.0346290604915495)
(48.69384334763882, -0.0209578612824846)
(1.9281422124858159, 0.310976551731524)
(83.2524937964679, 0.011867413529818)
(-48.69384334763882, -0.0209578612824846)
(-4.626842607632548, -0.258060787207482)
(92.67675047858768, -0.0109065936002076)
(89.53564004645072, 0.0110440269065513)
(36.12678546311355, -0.0284452866980815)
(10.979252893656982, -0.0992290820940922)
(-39.27120331626491, 0.0248163567056283)
(17.272100103060776, -0.0612252764721718)
(70.68623482231149, 0.013946966575841)
(-623.606146880461, 0.00160100479603768)
(-10.979252893656982, -0.0992290820940922)
(20.42512342193631, 0.0465731774705954)
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:
$$x_{1} = -98.9599644038221$$
$$x_{2} = -73.8270605507521$$
$$x_{3} = 67.5438038559559$$
$$x_{4} = 80.1103011235726$$
$$x_{5} = 98.9599644038221$$
$$x_{6} = 54.9772101700572$$
$$x_{7} = -36.1267854631135$$
$$x_{8} = -17.2721001030608$$
$$x_{9} = -42.4103901077775$$
$$x_{10} = -92.6767504785877$$
$$x_{11} = -67.5438038559559$$
$$x_{12} = -54.9772101700572$$
$$x_{13} = 73.8270605507521$$
$$x_{14} = -86.3935300869876$$
$$x_{15} = 42.4103901077775$$
$$x_{16} = 23.5583542044893$$
$$x_{17} = 61.2605241007865$$
$$x_{18} = -934.623812153386$$
$$x_{19} = 86.3935300869876$$
$$x_{20} = -61.2605241007865$$
$$x_{21} = -29.8428895570452$$
$$x_{22} = 4.62684260763255$$
$$x_{23} = -300.022076199367$$
$$x_{24} = -80.1103011235726$$
$$x_{25} = -249.756583899011$$
$$x_{26} = -23.5583542044893$$
$$x_{27} = 29.8428895570452$$
$$x_{28} = 48.6938433476388$$
$$x_{29} = -48.6938433476388$$
$$x_{30} = -4.62684260763255$$
$$x_{31} = 92.6767504785877$$
$$x_{32} = 36.1267854631135$$
$$x_{33} = 10.979252893657$$
$$x_{34} = 17.2721001030608$$
$$x_{35} = -10.979252893657$$
Puntos máximos de la función:
$$x_{35} = -26.7063338692132$$
$$x_{35} = -7.88515116887855$$
$$x_{35} = -76.9693574926784$$
$$x_{35} = 26.7063338692132$$
$$x_{35} = -14.1470612675535$$
$$x_{35} = -32.9885573139218$$
$$x_{35} = 7.88515116887855$$
$$x_{35} = 14.1470612675535$$
$$x_{35} = -45.5540563247426$$
$$x_{35} = -1.92814221248582$$
$$x_{35} = 32.9885573139218$$
$$x_{35} = -89.5356400464507$$
$$x_{35} = -83.2524937964679$$
$$x_{35} = 1302.19015609242$$
$$x_{35} = -64.4031313538059$$
$$x_{35} = -70.6862348223115$$
$$x_{35} = -20.4251234219363$$
$$x_{35} = 45.5540563247426$$
$$x_{35} = 51.8370225339475$$
$$x_{35} = -51.8370225339475$$
$$x_{35} = 39.2712033162649$$
$$x_{35} = -58.1200558177705$$
$$x_{35} = 64.4031313538059$$
$$x_{35} = 108.38511677127$$
$$x_{35} = 58.1200558177705$$
$$x_{35} = -95.8187937225186$$
$$x_{35} = 76.9693574926784$$
$$x_{35} = 95.8187937225186$$
$$x_{35} = 158.650508459697$$
$$x_{35} = 1.92814221248582$$
$$x_{35} = 83.2524937964679$$
$$x_{35} = 89.5356400464507$$
$$x_{35} = -39.2712033162649$$
$$x_{35} = 70.6862348223115$$
$$x_{35} = -623.606146880461$$
$$x_{35} = 20.4251234219363$$
Decrece en los intervalos
$$\left[98.9599644038221, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -934.623812153386\right]$$