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$$- \left(\frac{\left(5 x + 1\right) e^{- x}}{10} + \left(- \sin{\left(3 x \right)} - \cos{\left(3 x \right)}\right)\right) e^{- x} + \left(- \frac{\left(5 x + 1\right) e^{- x}}{10} + 3 \sin{\left(3 x \right)} - 3 \cos{\left(3 x \right)} + \frac{e^{- x}}{2}\right) e^{- x} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 22.1456977777362$$
$$x_{2} = 26.3344879829081$$
$$x_{3} = 92.3079337083009$$
$$x_{4} = 48.3256365580438$$
$$x_{5} = 37.8536610460778$$
$$x_{6} = 74.5055753379587$$
$$x_{7} = 52.5144267628302$$
$$x_{8} = 72.4111802355655$$
$$x_{9} = 70.3167851331723$$
$$x_{10} = 58.7976120700097$$
$$x_{11} = 20.051302672853$$
$$x_{12} = 24.240092880469$$
$$x_{13} = 8.53225049774278$$
$$x_{14} = 15.8625123211734$$
$$x_{15} = 94.4023288106941$$
$$x_{16} = 4.34724376067303$$
$$x_{17} = 83.9303532987281$$
$$x_{18} = 98.5911190154805$$
$$x_{19} = 54.6088218652234$$
$$x_{20} = 35.7592659436846$$
$$x_{21} = 76.5999704403519$$
$$x_{22} = 13.7681163159796$$
$$x_{23} = 46.2312414556506$$
$$x_{24} = 79.7415630939417$$
$$x_{25} = 50.420031660437$$
$$x_{26} = 81.8359581963349$$
$$x_{27} = 68.2223900307791$$
$$x_{28} = 64.0335998259927$$
$$x_{29} = 2.26416304399744$$
$$x_{30} = 36.8064634948812$$
$$x_{31} = 96.4967239130873$$
$$x_{32} = 90.2135386059077$$
$$x_{33} = -0.72745847963689$$
$$x_{34} = 80.7887606451383$$
$$x_{35} = 61.9392047235995$$
$$x_{36} = 30.5232781877015$$
$$x_{37} = 39.948056148471$$
$$x_{38} = 32.6176732900948$$
$$x_{39} = 101.73271166907$$
$$x_{40} = 88.1191435035145$$
$$x_{41} = 44.1368463532574$$
$$x_{42} = 86.0247484011213$$
$$x_{43} = 59.8448096212063$$
$$x_{44} = 42.0424512508642$$
$$x_{45} = 10.6265433903513$$
$$x_{46} = 66.1279949283859$$
$$x_{47} = 17.9569075524161$$
$$x_{48} = 0.144518174014588$$
$$x_{49} = 6.43846604277094$$
$$x_{50} = 28.4288830853075$$
Signos de extremos en los puntos:
(22.1456977777362, 3.23505680165699e-10)
(26.334487982908115, 4.90584065406066e-12)
(92.30793370830087, -1.09347789269048e-40)
(48.32563655804376, -1.3806352609674e-21)
(37.85366104607779, -4.87528647717543e-17)
(74.5055753379587, 5.89218008993792e-33)
(52.514426762830155, -2.09368089041596e-23)
(72.41118023556551, 4.78476098464533e-32)
(70.31678513317232, 3.88547826623289e-31)
(58.79761207000974, -3.90982916132322e-26)
(20.051302672852994, 2.62703677231108e-9)
(24.24009288046903, 3.98380134443299e-11)
(8.532250497742783, -0.000264180594666267)
(15.862512321173353, 1.73234725795639e-7)
(94.40232881069407, -1.34656019156947e-41)
(4.347243760673034, -0.0170498560189802)
(83.9303532987281, -4.75496090695342e-37)
(98.59111901548046, -2.04200734298823e-43)
(54.608821865223355, -2.57825728323334e-24)
(35.759265943684596, -3.95898974045166e-16)
(76.59997044035191, 7.25590814748596e-34)
(13.768116315979555, 1.40676392798952e-6)
(46.23124145565057, -1.12114864614941e-20)
(79.74156309394169, -3.13556221614897e-35)
(50.42003166043696, -1.70017930305068e-22)
(81.83595819633489, -3.8612790315009e-36)
(68.22239003077912, 3.1552132710109e-30)
(64.03359982599274, 2.08064118929055e-28)
(2.2641630439974403, -0.128090087988928)
(36.80646349488119, 1.38928791634061e-16)
(96.49672391308727, -1.65821765729365e-42)
(90.21353860590767, -8.87961718524583e-40)
(-0.7274584796368899, 1.75320051785408)
(80.7887606451383, 1.10033088828691e-35)
(61.93920472359954, 1.68959037802734e-27)
(30.52327818770148, 7.43952086322256e-14)
(39.94805614847098, -6.00365744615896e-18)
(32.617673290094785, 9.16137647201265e-15)
(101.73271166907026, 8.82431384139164e-45)
(88.11914350351448, -7.21071746247289e-39)
(44.136846353257376, -9.10431829679553e-20)
(86.02474840112129, -5.85548287036554e-38)
(59.84480962120634, 1.37203649539207e-26)
(42.042451250864175, -7.39318661571298e-19)
(10.626543390351333, -3.25501270738877e-5)
(66.12799492838593, 2.56219958095802e-29)
(17.956907552416126, 2.13329260616561e-8)
(0.14451817401458775, -1.01991797624022)
(6.438466042770937, -0.00213817120542923)
(28.428883085307465, 6.04128329881472e-13)
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:
$$x_{1} = 92.3079337083009$$
$$x_{2} = 48.3256365580438$$
$$x_{3} = 37.8536610460778$$
$$x_{4} = 52.5144267628302$$
$$x_{5} = 58.7976120700097$$
$$x_{6} = 8.53225049774278$$
$$x_{7} = 94.4023288106941$$
$$x_{8} = 4.34724376067303$$
$$x_{9} = 83.9303532987281$$
$$x_{10} = 98.5911190154805$$
$$x_{11} = 54.6088218652234$$
$$x_{12} = 35.7592659436846$$
$$x_{13} = 46.2312414556506$$
$$x_{14} = 79.7415630939417$$
$$x_{15} = 50.420031660437$$
$$x_{16} = 81.8359581963349$$
$$x_{17} = 2.26416304399744$$
$$x_{18} = 96.4967239130873$$
$$x_{19} = 90.2135386059077$$
$$x_{20} = 39.948056148471$$
$$x_{21} = 88.1191435035145$$
$$x_{22} = 44.1368463532574$$
$$x_{23} = 86.0247484011213$$
$$x_{24} = 42.0424512508642$$
$$x_{25} = 10.6265433903513$$
$$x_{26} = 0.144518174014588$$
$$x_{27} = 6.43846604277094$$
Puntos máximos de la función:
$$x_{27} = 22.1456977777362$$
$$x_{27} = 26.3344879829081$$
$$x_{27} = 74.5055753379587$$
$$x_{27} = 72.4111802355655$$
$$x_{27} = 70.3167851331723$$
$$x_{27} = 20.051302672853$$
$$x_{27} = 24.240092880469$$
$$x_{27} = 15.8625123211734$$
$$x_{27} = 76.5999704403519$$
$$x_{27} = 13.7681163159796$$
$$x_{27} = 68.2223900307791$$
$$x_{27} = 64.0335998259927$$
$$x_{27} = 36.8064634948812$$
$$x_{27} = -0.72745847963689$$
$$x_{27} = 80.7887606451383$$
$$x_{27} = 61.9392047235995$$
$$x_{27} = 30.5232781877015$$
$$x_{27} = 32.6176732900948$$
$$x_{27} = 101.73271166907$$
$$x_{27} = 59.8448096212063$$
$$x_{27} = 66.1279949283859$$
$$x_{27} = 17.9569075524161$$
$$x_{27} = 28.4288830853075$$
Decrece en los intervalos
$$\left[98.5911190154805, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 0.144518174014588\right]$$