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$$\frac{- e^{x} \sin{\left(x \right)} + e^{x} \cos{\left(x \right)}}{x} - \frac{e^{x} \cos{\left(x \right)}}{x^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -68.3223752642964$$
$$x_{2} = 25.8984556983654$$
$$x_{3} = -21.182694633356$$
$$x_{4} = -93.4570599146458$$
$$x_{5} = -40.0429743654917$$
$$x_{6} = -74.6061683782845$$
$$x_{7} = -87.1734932209778$$
$$x_{8} = -71.4642850900844$$
$$x_{9} = -14.8900880847917$$
$$x_{10} = -33.7575267296448$$
$$x_{11} = -80.8898676363837$$
$$x_{12} = -90.315283165105$$
$$x_{13} = -77.7480283259493$$
$$x_{14} = -8.58439584086157$$
$$x_{15} = -36.9003456156361$$
$$x_{16} = 22.7540827305528$$
$$x_{17} = -58.8964444413399$$
$$x_{18} = 6.99171397294222$$
$$x_{19} = 32.1855459430969$$
$$x_{20} = -49.4700786400964$$
$$x_{21} = 3.77551226807681$$
$$x_{22} = -11.7401459632485$$
$$x_{23} = -24.3272065905731$$
$$x_{24} = -30.6144600567864$$
$$x_{25} = -99.7405787929127$$
$$x_{26} = -2.171150616426$$
$$x_{27} = 13.3127649854021$$
$$x_{28} = 16.4620473680961$$
$$x_{29} = -96.5988247504869$$
$$x_{30} = 29.0422159262667$$
$$x_{31} = -65.1804350919889$$
$$x_{32} = 10.1584541766013$$
$$x_{33} = -43.1854540292704$$
$$x_{34} = -55.754381638728$$
$$x_{35} = -5.41343454978119$$
$$x_{36} = -62.0384599985962$$
$$x_{37} = 19.6087940910157$$
$$x_{38} = -46.3278146314103$$
$$x_{39} = -27.4710620052193$$
$$x_{40} = -84.0316886109242$$
$$x_{41} = -18.0371914942542$$
$$x_{42} = -52.6122632039851$$
Signos de extremos en los puntos:
(-68.32237526429635, -2.18631792775718e-32)
(25.898455698365435, 4922094551.8402)
(-21.182694633356043, 2.05934409421649e-11)
(-93.45705991464582, -1.94385568258726e-43)
(-40.04297436549173, 7.09730657524411e-20)
(-74.60616837828448, -3.73897472577399e-35)
(-87.17349322097783, -1.11594439435482e-40)
(-71.46428509008439, 9.03260121741129e-34)
(-14.89008808479168, 1.56794826385968e-8)
(-33.7575267296448, 4.50790923313047e-17)
(-80.88986763638373, -6.43996205828751e-38)
(-90.31528316510503, 4.6546857765198e-42)
(-77.74802832594926, 1.55046887367563e-36)
(-8.584395840861575, 1.45337066444609e-5)
(-36.90034561563612, -1.78219039595166e-18)
(22.754082730552835, -242068503.87686)
(-58.89644444133988, 3.14273919682565e-28)
(6.991713972942219, 118.114727412863)
(32.185545943096855, 2121166417232.69)
(-49.47007864009639, -4.63629494943761e-24)
(3.775512268076811, -9.30868077852204)
(-11.740145963248548, -4.59891893913301e-7)
(-24.327206590573052, -7.74992513837921e-13)
(-30.614460056786445, -1.15020591421023e-15)
(-99.74057879291273, -3.40136346371062e-46)
(-2.1711506164259973, 0.0296749283468515)
(13.312764985402064, 33355.8555886438)
(16.46204736809609, -624539.306541806)
(-96.59882475048693, 8.12697125094014e-45)
(29.042215926266735, -101579204300.65)
(-65.1804350919889, 5.30314020107426e-31)
(10.158454176601259, -1886.93443153188)
(-43.185454029270375, -2.84390654620895e-21)
(-55.75438163872798, -7.6822989861738e-27)
(-5.413434549781193, -0.000530974345268083)
(-62.03845999859621, -1.28932705678727e-29)
(19.60879409101571, 12136519.8730325)
(-46.32781463141033, 1.14562400114401e-22)
(-27.471062005219288, 2.966033348239e-14)
(-84.03168861092416, 2.67891659017783e-39)
(-18.037191494254227, -5.59539057148987e-10)
(-52.61226320398511, 1.88388921924828e-25)
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:
$$x_{1} = -68.3223752642964$$
$$x_{2} = -93.4570599146458$$
$$x_{3} = -74.6061683782845$$
$$x_{4} = -87.1734932209778$$
$$x_{5} = -80.8898676363837$$
$$x_{6} = -36.9003456156361$$
$$x_{7} = 22.7540827305528$$
$$x_{8} = -49.4700786400964$$
$$x_{9} = 3.77551226807681$$
$$x_{10} = -11.7401459632485$$
$$x_{11} = -24.3272065905731$$
$$x_{12} = -30.6144600567864$$
$$x_{13} = -99.7405787929127$$
$$x_{14} = 16.4620473680961$$
$$x_{15} = 29.0422159262667$$
$$x_{16} = 10.1584541766013$$
$$x_{17} = -43.1854540292704$$
$$x_{18} = -55.754381638728$$
$$x_{19} = -5.41343454978119$$
$$x_{20} = -62.0384599985962$$
$$x_{21} = -18.0371914942542$$
Puntos máximos de la función:
$$x_{21} = 25.8984556983654$$
$$x_{21} = -21.182694633356$$
$$x_{21} = -40.0429743654917$$
$$x_{21} = -71.4642850900844$$
$$x_{21} = -14.8900880847917$$
$$x_{21} = -33.7575267296448$$
$$x_{21} = -90.315283165105$$
$$x_{21} = -77.7480283259493$$
$$x_{21} = -8.58439584086157$$
$$x_{21} = -58.8964444413399$$
$$x_{21} = 6.99171397294222$$
$$x_{21} = 32.1855459430969$$
$$x_{21} = -2.171150616426$$
$$x_{21} = 13.3127649854021$$
$$x_{21} = -96.5988247504869$$
$$x_{21} = -65.1804350919889$$
$$x_{21} = 19.6087940910157$$
$$x_{21} = -46.3278146314103$$
$$x_{21} = -27.4710620052193$$
$$x_{21} = -84.0316886109242$$
$$x_{21} = -52.6122632039851$$
Decrece en los intervalos
$$\left[29.0422159262667, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -99.7405787929127\right]$$