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$$e^{x} \cos{\left(\frac{1}{x} \right)} + \frac{e^{x} \sin{\left(\frac{1}{x} \right)}}{x^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -116.872021670512$$
$$x_{2} = -48.8724975241006$$
$$x_{3} = -80.8720704571076$$
$$x_{4} = -36.8740003526042$$
$$x_{5} = -38.8734966418265$$
$$x_{6} = -102.872031841956$$
$$x_{7} = -90.8720474508581$$
$$x_{8} = -64.8721569381801$$
$$x_{9} = -84.8720596789874$$
$$x_{10} = -86.8720551498385$$
$$x_{11} = -94.8720412045782$$
$$x_{12} = -118.872020633463$$
$$x_{13} = -74.8720924741926$$
$$x_{14} = -112.872024004138$$
$$x_{15} = -52.8723548044384$$
$$x_{16} = -62.8721769202787$$
$$x_{17} = -72.8721019473723$$
$$x_{18} = -78.872076892905$$
$$x_{19} = -104.872029993321$$
$$x_{20} = -110.872025319078$$
$$x_{21} = -106.872028300374$$
$$x_{22} = -33.7418263587702$$
$$x_{23} = -70.8721128226877$$
$$x_{24} = -66.8721399356285$$
$$x_{25} = -92.8720441690258$$
$$x_{26} = -98.872036082576$$
$$x_{27} = -56.8722627715123$$
$$x_{28} = -32.8760542787127$$
$$x_{29} = -108.872026747007$$
$$x_{30} = -60.8722005743599$$
$$x_{31} = -42.8729103229157$$
$$x_{32} = -28.8830757386704$$
$$x_{33} = -114.872022791192$$
$$x_{34} = -44.8727327029964$$
$$x_{35} = -76.8720841826661$$
$$x_{36} = -46.8725995390883$$
$$x_{37} = -30.8783530263603$$
$$x_{38} = -1.11706126780097$$
$$x_{39} = -100.87203386468$$
$$x_{40} = -68.8721253724289$$
$$x_{41} = -40.8731534129658$$
$$x_{42} = -50.8724179188406$$
$$x_{43} = -82.8720647530384$$
$$x_{44} = -34.8747768745665$$
$$x_{45} = -120.872019672365$$
$$x_{46} = -54.8723040648736$$
$$x_{47} = -96.8720385198873$$
$$x_{48} = -88.8720510939801$$
$$x_{49} = -58.8722287983338$$
Signos de extremos en los puntos:
(-116.87202167051188, 1.75028996067271e-51)
(-48.87249752410059, 5.95460680308508e-22)
(-80.87207045710755, 7.54523651924712e-36)
(-36.87400035260424, 9.6753213501017e-17)
(-38.873496641826534, 1.31012038306423e-17)
(-102.87203184195639, 2.10486239596238e-45)
(-90.87204745085809, 3.42566535933592e-40)
(-64.87215693818007, 6.70391674133523e-29)
(-84.87205967898743, 1.38198289355464e-37)
(-86.87205514983854, 1.8703248433872e-38)
(-94.87204120457815, 6.2743955201917e-42)
(-118.87202063346264, 2.36876522555237e-52)
(-74.87209247419263, 3.04385985474203e-33)
(-112.87202400413774, 9.55621185321779e-50)
(-52.87235480443839, 1.09081319002072e-23)
(-62.87217692027873, 4.95342466634505e-28)
(-72.87210194737234, 2.24909265313479e-32)
(-78.872076892905, 5.57515982043016e-35)
(-104.8720299933212, 2.84863183606297e-46)
(-110.87202531907832, 7.06111917435004e-49)
(-106.87202830037366, 3.85521698904238e-47)
(-33.741826358770155, 2.21778910648129e-15)
(-70.87211282268767, 1.66184014894671e-31)
(-66.87213993562854, 9.07298249019148e-30)
(-92.87204416902584, 4.63616109254977e-41)
(-98.87203608257605, 1.14920657325123e-43)
(-56.872262771512275, 1.99812643656747e-25)
(-32.876054278712665, 5.2712073739094e-15)
(-108.87202674700657, 5.21748525094378e-48)
(-60.87220057435991, 3.65999577526875e-27)
(-42.87291032291573, 2.4011178440574e-19)
(-28.88307573867038, 2.85745393797008e-13)
(-114.87202279119226, 1.2932959586006e-50)
(-44.8727327029964, 3.25021393450706e-20)
(-76.87208418266611, 4.11946938328481e-34)
(-46.872599539088334, 4.39936326370052e-21)
(-30.87835302636025, 3.8857413332873e-14)
(-1.117061267800967, 0.20464220019704)
(-100.87203386467951, 1.55528854361472e-44)
(-68.87212537242888, 1.2279203958438e-30)
(-40.87315341296576, 1.7737198297145e-18)
(-50.87241791884065, 8.05945558066686e-23)
(-82.87206475303842, 1.02114626878608e-36)
(-34.874776874566535, 7.14329001988763e-16)
(-120.87201967236489, 3.20578193116953e-53)
(-54.87230406487358, 1.47634892653928e-24)
(-96.87203851988727, 8.49151302303745e-43)
(-88.87205109398006, 2.53122715392191e-39)
(-58.87222879833376, 2.70428986637127e-26)
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:
La función no tiene puntos mínimos
Puntos máximos de la función:
$$x_{49} = -1.11706126780097$$
Decrece en los intervalos
$$\left(-\infty, -1.11706126780097\right]$$
Crece en los intervalos
$$\left[-1.11706126780097, \infty\right)$$