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$$x e^{x} \sin{\left(x \right)} + \left(\left(- x \cos{\left(x \right)} - 1\right) + \sin{\left(x \right)}\right) e^{x} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 3.63614085442611$$
$$x_{2} = -40.0247669690155$$
$$x_{3} = -202.570295845803$$
$$x_{4} = -84.0231512440298$$
$$x_{5} = -62.0498198248722$$
$$x_{6} = -5.53898388760792$$
$$x_{7} = -77.7387900851067$$
$$x_{8} = -33.735803492797$$
$$x_{9} = -93.4646092619029$$
$$x_{10} = 10.096318237648$$
$$x_{11} = -55.7670170583429$$
$$x_{12} = -87.1815854381936$$
$$x_{13} = -11.799310071313$$
$$x_{14} = -21.1472952972999$$
$$x_{15} = -99.7476535314933$$
$$x_{16} = -80.8985868536874$$
$$x_{17} = 16.422042703626$$
$$x_{18} = -96.5914121108004$$
$$x_{19} = 13.3667088973172$$
$$x_{20} = -43.2017492208242$$
$$x_{21} = -71.4542205950111$$
$$x_{22} = -68.332693454702$$
$$x_{23} = -27.444139007049$$
$$x_{24} = 22.7245770102362$$
$$x_{25} = -18.0759435437534$$
$$x_{26} = -46.3121433230492$$
$$x_{27} = -90.3073478196549$$
$$x_{28} = -65.1693820090398$$
$$x_{29} = 19.6452362607766$$
$$x_{30} = -74.615619927002$$
$$x_{31} = 0.934204800997839$$
$$x_{32} = -8.48841166585914$$
$$x_{33} = -49.4843124205006$$
$$x_{34} = -58.8841873774204$$
$$x_{35} = -36.9194006481444$$
$$x_{36} = -24.3560254935667$$
$$x_{37} = 25.9259772956177$$
$$x_{38} = 7.0958770591975$$
$$x_{39} = -52.5985077508649$$
$$x_{40} = -30.6374009034184$$
$$x_{41} = -14.8384022309755$$
Signos de extremos en los puntos:
(3.6361408544261073, 65.4870584045966)
(-40.02476696901548, -1.20821553003001e-16)
(-202.57029584580343, 1.12665411056714e-87)
(-84.02315124402982, -1.94661340509247e-35)
(-62.04981982487223, 4.93020389892824e-26)
(-5.538983887607923, 0.0147473932851821)
(-77.73879008510667, -9.6666818750798e-33)
(-33.73580349279697, -5.51462302336914e-14)
(-93.46460926190288, 1.6904349124844e-39)
(10.096318237648006, 152357.254347151)
(-55.76701705834285, 2.37094250361599e-23)
(-87.18158543819362, 8.440888079831e-37)
(-11.799310071313025, 6.14970915133252e-5)
(-21.147295297299948, -1.03405481883767e-8)
(-99.74765353149333, 3.36995427235159e-42)
(-80.89858685368739, 4.19270622633503e-34)
(16.42204270362597, 145753604.01587)
(-96.59141211080038, -7.77488320524273e-41)
(13.366708897317233, -6123360.56004408)
(-43.20174922082419, 5.25518923039174e-18)
(-71.45422059501108, -4.77093194429667e-30)
(-68.33269345470197, 1.01454608419165e-28)
(-27.444139007048975, -2.44177047942839e-11)
(22.724577010236207, 112551998397.141)
(-18.07594354375344, 1.78288830130343e-7)
(-46.312143323049206, -2.58951349979634e-19)
(-90.30734781965488, -3.899283665924e-38)
(-65.16938200903975, -2.3376661856707e-27)
(19.64523626077659, -4775071191.47761)
(-74.615619927002, 2.06988283804643e-31)
(0.9342048009978386, -1.91199399612607)
(-8.488411665859138, -0.00140725538768078)
(-49.48431242050056, 1.12549787524123e-20)
(-58.88418737742038, -1.13553857333513e-24)
(-36.91940064814441, 2.40084293545839e-15)
(-24.356025493566655, 4.51440260886129e-10)
(25.925977295617667, -3358199036136.65)
(7.095877059197498, -6219.09223170797)
(-52.59850775086492, -5.45819933528738e-22)
(-30.63740090341845, 1.06433283419363e-12)
(-14.838402230975538, -4.07633931747515e-6)
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:
$$x_{1} = -40.0247669690155$$
$$x_{2} = -84.0231512440298$$
$$x_{3} = -77.7387900851067$$
$$x_{4} = -33.735803492797$$
$$x_{5} = -21.1472952972999$$
$$x_{6} = -96.5914121108004$$
$$x_{7} = 13.3667088973172$$
$$x_{8} = -71.4542205950111$$
$$x_{9} = -27.444139007049$$
$$x_{10} = -46.3121433230492$$
$$x_{11} = -90.3073478196549$$
$$x_{12} = -65.1693820090398$$
$$x_{13} = 19.6452362607766$$
$$x_{14} = 0.934204800997839$$
$$x_{15} = -8.48841166585914$$
$$x_{16} = -58.8841873774204$$
$$x_{17} = 25.9259772956177$$
$$x_{18} = 7.0958770591975$$
$$x_{19} = -52.5985077508649$$
$$x_{20} = -14.8384022309755$$
Puntos máximos de la función:
$$x_{20} = 3.63614085442611$$
$$x_{20} = -62.0498198248722$$
$$x_{20} = -5.53898388760792$$
$$x_{20} = -93.4646092619029$$
$$x_{20} = 10.096318237648$$
$$x_{20} = -55.7670170583429$$
$$x_{20} = -87.1815854381936$$
$$x_{20} = -11.799310071313$$
$$x_{20} = -99.7476535314933$$
$$x_{20} = -80.8985868536874$$
$$x_{20} = 16.422042703626$$
$$x_{20} = -43.2017492208242$$
$$x_{20} = -68.332693454702$$
$$x_{20} = 22.7245770102362$$
$$x_{20} = -18.0759435437534$$
$$x_{20} = -74.615619927002$$
$$x_{20} = -49.4843124205006$$
$$x_{20} = -36.9194006481444$$
$$x_{20} = -24.3560254935667$$
$$x_{20} = -30.6374009034184$$
Decrece en los intervalos
$$\left[25.9259772956177, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -96.5914121108004\right]$$