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$$\left(- x \sin{\left(x \right)} - 2 \cos{\left(x \right)}\right) e^{x} + \left(- x \cos{\left(x \right)} + \sin{\left(x \right)}\right) e^{x} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -101.301483443117$$
$$x_{2} = 21.136533975368$$
$$x_{3} = 52.5934323788799$$
$$x_{4} = -66.7362015328148$$
$$x_{5} = 17.9831803577612$$
$$x_{6} = -104.443525820276$$
$$x_{7} = -13.234518967478$$
$$x_{8} = -60.4506432185942$$
$$x_{9} = -79.3061827617297$$
$$x_{10} = -32.1539727052608$$
$$x_{11} = -69.878819478905$$
$$x_{12} = -82.4485050228275$$
$$x_{13} = -22.709109301662$$
$$x_{14} = -63.5934814660579$$
$$x_{15} = -57.3076671756744$$
$$x_{16} = 1.77284537202095$$
$$x_{17} = -25.8590577697517$$
$$x_{18} = -3.45762927914644$$
$$x_{19} = -47.8776380334436$$
$$x_{20} = 27.4352917154902$$
$$x_{21} = -85.5907734027611$$
$$x_{22} = 5.24227625159811$$
$$x_{23} = -6.8361253524594$$
$$x_{24} = 24.2869009417436$$
$$x_{25} = -38.4449996784093$$
$$x_{26} = -88.7329936581891$$
$$x_{27} = -19.5564023459924$$
$$x_{28} = -76.1637999064041$$
$$x_{29} = -54.1645291264666$$
$$x_{30} = 14.8249965889442$$
$$x_{31} = -91.8751707538451$$
$$x_{32} = -16.3992960566677$$
$$x_{33} = 8.47375692649236$$
$$x_{34} = -98.1594121296962$$
$$x_{35} = -95.0173089941994$$
$$x_{36} = -29.0071621707914$$
$$x_{37} = -10.0544523473053$$
$$x_{38} = 11.6582194214432$$
$$x_{39} = -73.0213485801257$$
$$x_{40} = -35.2998403716107$$
$$x_{41} = -44.733797581381$$
$$x_{42} = -41.5896132875985$$
$$x_{43} = -51.0211988336933$$
Signos de extremos en los puntos:
(-101.30148344311704, -7.28804382062422e-43)
(21.13653397536802, -22117887701.9285)
(52.5934323788799, -2.55555566187774e+24)
(-66.73620153281477, 4.94347256593906e-28)
(17.983180357761203, 801104933.43779)
(-104.44352582027601, 3.24517464393413e-44)
(-13.234518967477959, -1.74654212658824e-5)
(-60.45064321859424, 2.40554761739842e-25)
(-79.30618276172967, 2.03873450145918e-33)
(-32.15397270526078, -2.5094894980679e-13)
(-69.87881947890499, -2.23377731123586e-29)
(-82.4485050228275, -9.15026729207009e-35)
(-22.709109301661965, 2.25738654239487e-9)
(-63.59348146605792, -1.091741077811e-26)
(-57.30766717567436, -5.2870440964363e-24)
(1.772845372020951, -7.86243543366342)
(-25.85905776975167, -1.09817047251221e-10)
(-3.4576292791464414, 0.0937439764769793)
(-47.8776380334436, 5.51244444259474e-20)
(27.435291715490195, -15684620629094.6)
(-85.59077340276107, 4.10116198155916e-36)
(5.2422762515981125, 664.213854766819)
(-6.836125352459403, -0.00568523251375146)
(24.286900941743593, 594771730220.334)
(-38.44499967840931, -5.54379496340967e-16)
(-88.73299365818906, -1.835787043832e-37)
(-19.556402345992414, -4.56781297584888e-8)
(-76.16379990640405, -4.53565928150833e-32)
(-54.164529126466604, 1.15877171002088e-22)
(14.824996588944192, -27948067.7349385)
(-91.87517075384513, 8.20763087183536e-39)
(-16.39929605666771, 9.05580940875288e-7)
(8.47375692649236, -27460.9630783351)
(-98.15941212969621, 1.63524441525757e-41)
(-95.01730899419941, -3.66545285779068e-40)
(-29.007162170791386, 5.27620574510492e-12)
(-10.054452347305288, 0.000324058805787881)
(11.658219421443249, 920542.203423491)
(-73.02134858012569, 1.00744203847326e-30)
(-35.29984037161067, 1.18364312001276e-14)
(-44.73379758138097, -1.1954877830457e-18)
(-41.589613287598475, 2.58104656547556e-17)
(-51.021198833693305, -2.53180213022537e-21)
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:
$$x_{1} = -101.301483443117$$
$$x_{2} = 21.136533975368$$
$$x_{3} = 52.5934323788799$$
$$x_{4} = -13.234518967478$$
$$x_{5} = -32.1539727052608$$
$$x_{6} = -69.878819478905$$
$$x_{7} = -82.4485050228275$$
$$x_{8} = -63.5934814660579$$
$$x_{9} = -57.3076671756744$$
$$x_{10} = 1.77284537202095$$
$$x_{11} = -25.8590577697517$$
$$x_{12} = 27.4352917154902$$
$$x_{13} = -6.8361253524594$$
$$x_{14} = -38.4449996784093$$
$$x_{15} = -88.7329936581891$$
$$x_{16} = -19.5564023459924$$
$$x_{17} = -76.1637999064041$$
$$x_{18} = 14.8249965889442$$
$$x_{19} = 8.47375692649236$$
$$x_{20} = -95.0173089941994$$
$$x_{21} = -44.733797581381$$
$$x_{22} = -51.0211988336933$$
Puntos máximos de la función:
$$x_{22} = -66.7362015328148$$
$$x_{22} = 17.9831803577612$$
$$x_{22} = -104.443525820276$$
$$x_{22} = -60.4506432185942$$
$$x_{22} = -79.3061827617297$$
$$x_{22} = -22.709109301662$$
$$x_{22} = -3.45762927914644$$
$$x_{22} = -47.8776380334436$$
$$x_{22} = -85.5907734027611$$
$$x_{22} = 5.24227625159811$$
$$x_{22} = 24.2869009417436$$
$$x_{22} = -54.1645291264666$$
$$x_{22} = -91.8751707538451$$
$$x_{22} = -16.3992960566677$$
$$x_{22} = -98.1594121296962$$
$$x_{22} = -29.0071621707914$$
$$x_{22} = -10.0544523473053$$
$$x_{22} = 11.6582194214432$$
$$x_{22} = -73.0213485801257$$
$$x_{22} = -35.2998403716107$$
$$x_{22} = -41.5896132875985$$
Decrece en los intervalos
$$\left[52.5934323788799, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -101.301483443117\right]$$