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$$- 2 \left(- x - 1\right) e^{- 2 x} - 4 \sin{\left(x \right)} - 3 \cos{\left(x \right)} - e^{- 2 x} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 62.1883519630026$$
$$x_{2} = 18.2060548127455$$
$$x_{3} = 43.3387960414638$$
$$x_{4} = 5.63971521638853$$
$$x_{5} = 103.02905645967$$
$$x_{6} = 68.4715372701822$$
$$x_{7} = 52.7635740022332$$
$$x_{8} = 8.78127676440765$$
$$x_{9} = 65.3299446165924$$
$$x_{10} = 74.7547225773617$$
$$x_{11} = 90.4626858453107$$
$$x_{12} = 33.9140180806944$$
$$x_{13} = 15.0644621591552$$
$$x_{14} = 21.3476474663353$$
$$x_{15} = 143.869760956337$$
$$x_{16} = 37.0556107342842$$
$$x_{17} = 96.7458711524903$$
$$x_{18} = 40.197203387874$$
$$x_{19} = 46.4803886950536$$
$$x_{20} = 87.3210931917209$$
$$x_{21} = 59.0467593094128$$
$$x_{22} = 77.8963152309515$$
$$x_{23} = 99.8874638060801$$
$$x_{24} = 30.7724254271046$$
$$x_{25} = 2.48986826930282$$
$$x_{26} = 55.905166655823$$
$$x_{27} = 71.613129923772$$
$$x_{28} = 11.9228695057848$$
$$x_{29} = 84.1795005381311$$
$$x_{30} = 27.6308327735149$$
$$x_{31} = 49.6219813486434$$
$$x_{32} = 93.6042784989005$$
$$x_{33} = 81.0379078845413$$
$$x_{34} = 24.4892401199251$$
Signos de extremos en los puntos:
(62.18835196300258, 5)
(18.206054812745474, 5)
(43.33879604146382, 5)
(5.6397152163885265, 4.99991613755639)
(103.02905645966989, -5)
(68.47153727018217, 5)
(52.7635740022332, -5)
(8.781276764407652, -5.00000023071478)
(65.32994461659237, -5)
(74.75472257736175, 5)
(90.46268584531072, -5)
(33.91401808069444, -5)
(15.06446215915517, -5.00000000000132)
(21.347647466335268, -5)
(143.86976095633722, 5)
(37.05561073428424, 5)
(96.74587115249031, -5)
(40.197203387874026, -5)
(46.48038869505361, -5)
(87.32109319172092, 5)
(59.046759309412785, -5)
(77.89631523095154, -5)
(99.8874638060801, 5)
(30.772425427104647, 5)
(2.489868269302824, -5.02382683926261)
(55.905166655822995, 5)
(71.61312992377196, -5)
(11.922869505784771, 4.99999999943077)
(84.17950053813114, -5)
(27.630832773514854, -5)
(49.62198134864341, 5)
(93.60427849890051, 5)
(81.03790788454134, 5)
(24.48924011992506, 5)
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:
$$x_{1} = 103.02905645967$$
$$x_{2} = 52.7635740022332$$
$$x_{3} = 8.78127676440765$$
$$x_{4} = 65.3299446165924$$
$$x_{5} = 90.4626858453107$$
$$x_{6} = 33.9140180806944$$
$$x_{7} = 15.0644621591552$$
$$x_{8} = 21.3476474663353$$
$$x_{9} = 96.7458711524903$$
$$x_{10} = 40.197203387874$$
$$x_{11} = 46.4803886950536$$
$$x_{12} = 59.0467593094128$$
$$x_{13} = 77.8963152309515$$
$$x_{14} = 2.48986826930282$$
$$x_{15} = 71.613129923772$$
$$x_{16} = 84.1795005381311$$
$$x_{17} = 27.6308327735149$$
Puntos máximos de la función:
$$x_{17} = 62.1883519630026$$
$$x_{17} = 18.2060548127455$$
$$x_{17} = 43.3387960414638$$
$$x_{17} = 5.63971521638853$$
$$x_{17} = 68.4715372701822$$
$$x_{17} = 74.7547225773617$$
$$x_{17} = 143.869760956337$$
$$x_{17} = 37.0556107342842$$
$$x_{17} = 87.3210931917209$$
$$x_{17} = 99.8874638060801$$
$$x_{17} = 30.7724254271046$$
$$x_{17} = 55.905166655823$$
$$x_{17} = 11.9228695057848$$
$$x_{17} = 49.6219813486434$$
$$x_{17} = 93.6042784989005$$
$$x_{17} = 81.0379078845413$$
$$x_{17} = 24.4892401199251$$
Decrece en los intervalos
$$\left[103.02905645967, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 2.48986826930282\right]$$