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$$- \left(- \frac{e^{x} \cos{\left(x \right)}}{2} + \left(\frac{e^{x} \sin{\left(x \right)}}{2} + 1\right)\right) e^{- x} + \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 58.9048622548086$$
$$x_{2} = 24.3473430653586$$
$$x_{3} = 93.4623814442964$$
$$x_{4} = 55.7632696012188$$
$$x_{5} = 40.0553063332699$$
$$x_{6} = 18.0641577783413$$
$$x_{7} = 8.63912942363856$$
$$x_{8} = 46.3384916404494$$
$$x_{9} = 5.50354628352692$$
$$x_{10} = 71.4712328691678$$
$$x_{11} = 49.4800842940392$$
$$x_{12} = 36.9137136796801$$
$$x_{13} = 33.7721210260903$$
$$x_{14} = 90.3207887907066$$
$$x_{15} = 99.7455667514759$$
$$x_{16} = 80.8960108299372$$
$$x_{17} = 14.9225646371097$$
$$x_{18} = 96.6039740978861$$
$$x_{19} = 74.6128255227576$$
$$x_{20} = 30.6305283725006$$
$$x_{21} = 62.0464549083984$$
$$x_{22} = 11.780983267766$$
$$x_{23} = 43.1968989868597$$
$$x_{24} = 65.1880475619882$$
$$x_{25} = 0.416296802471156$$
$$x_{26} = 21.2057504108582$$
$$x_{27} = 68.329640215578$$
$$x_{28} = 87.1791961371168$$
$$x_{29} = 52.621676947629$$
$$x_{30} = 84.037603483527$$
$$x_{31} = 2.19862901315928$$
$$x_{32} = 77.7544181763474$$
$$x_{33} = 27.4889357189091$$
Signos de extremos en los puntos:
(58.90486225480862, 0.707106781186548)
(24.34734306535862, -0.707106781159874)
(93.46238144429635, -0.707106781186548)
(55.76326960121883, -0.707106781186548)
(40.05530633326986, 0.707106781186547)
(18.064157778341293, -0.707106766903004)
(8.639129423638558, 0.707283799986193)
(46.33849164044945, 0.707106781186547)
(5.50354628352692, -0.703022750413728)
(71.47123286916779, 0.707106781186547)
(49.480084294039244, -0.707106781186548)
(36.91371367968007, -0.707106781186547)
(33.772121026090275, 0.70710678118655)
(90.32078879070656, 0.707106781186548)
(99.74556675147593, -0.707106781186547)
(80.89601082993718, -0.707106781186548)
(14.922564637109746, 0.707107111717717)
(96.60397409788614, 0.707106781186547)
(74.61282552275759, -0.707106781186547)
(30.630528372500553, -0.707106781186498)
(62.04645490839842, -0.707106781186547)
(11.780983267766045, -0.707099132509495)
(43.19689898685966, -0.707106781186547)
(65.18804756198821, 0.707106781186547)
(0.41629680247115647, 0.404376316137291)
(21.205750410858183, 0.707106781803795)
(68.329640215578, -0.707106781186548)
(87.17919613711676, -0.707106781186547)
(52.621676947629034, 0.707106781186548)
(84.03760348352696, 0.707106781186548)
(2.1986290131592794, 0.809302471027555)
(77.75441817634739, 0.707106781186548)
(27.48893571890906, 0.7071067811877)
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:
$$x_{1} = 24.3473430653586$$
$$x_{2} = 93.4623814442964$$
$$x_{3} = 55.7632696012188$$
$$x_{4} = 18.0641577783413$$
$$x_{5} = 5.50354628352692$$
$$x_{6} = 49.4800842940392$$
$$x_{7} = 36.9137136796801$$
$$x_{8} = 99.7455667514759$$
$$x_{9} = 80.8960108299372$$
$$x_{10} = 74.6128255227576$$
$$x_{11} = 30.6305283725006$$
$$x_{12} = 62.0464549083984$$
$$x_{13} = 11.780983267766$$
$$x_{14} = 43.1968989868597$$
$$x_{15} = 0.416296802471156$$
$$x_{16} = 68.329640215578$$
$$x_{17} = 87.1791961371168$$
Puntos máximos de la función:
$$x_{17} = 58.9048622548086$$
$$x_{17} = 40.0553063332699$$
$$x_{17} = 8.63912942363856$$
$$x_{17} = 46.3384916404494$$
$$x_{17} = 71.4712328691678$$
$$x_{17} = 33.7721210260903$$
$$x_{17} = 90.3207887907066$$
$$x_{17} = 14.9225646371097$$
$$x_{17} = 96.6039740978861$$
$$x_{17} = 65.1880475619882$$
$$x_{17} = 21.2057504108582$$
$$x_{17} = 52.621676947629$$
$$x_{17} = 84.037603483527$$
$$x_{17} = 2.19862901315928$$
$$x_{17} = 77.7544181763474$$
$$x_{17} = 27.4889357189091$$
Decrece en los intervalos
$$\left[99.7455667514759, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 0.416296802471156\right]$$