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$$\left(1 - \left|{x}\right|\right) \left(- \sin{\left(x \right)} + \cos{\left(x \right)}\right) - \left(\sin{\left(x \right)} + \cos{\left(x \right)}\right) \operatorname{sign}{\left(x \right)} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -52.6410389715955$$
$$x_{2} = 63.6332158480386$$
$$x_{3} = -55.7815219044393$$
$$x_{4} = -90.3319825222781$$
$$x_{5} = 47.930592805665$$
$$x_{6} = 16.5575505978831$$
$$x_{7} = 7.22779492037099$$
$$x_{8} = 25.9581849881156$$
$$x_{9} = -84.0496438924782$$
$$x_{10} = -65.2036217479876$$
$$x_{11} = 95.0438107123307$$
$$x_{12} = 57.3518097246237$$
$$x_{13} = -14.993903529302$$
$$x_{14} = -96.6144323887125$$
$$x_{15} = 69.9149461644257$$
$$x_{16} = 101.326330221322$$
$$x_{17} = -87.1907977832234$$
$$x_{18} = 19.6884121967352$$
$$x_{19} = -46.360533666053$$
$$x_{20} = 4.22745225886556$$
$$x_{21} = 38.5111624251243$$
$$x_{22} = -77.7674437949475$$
$$x_{23} = -2.85142429820486$$
$$x_{24} = -49.5006996323644$$
$$x_{25} = -5.70711911551724$$
$$x_{26} = 32.2333308441804$$
$$x_{27} = 85.6202167672022$$
$$x_{28} = 76.1969194828044$$
$$x_{29} = 35.3720025945026$$
$$x_{30} = -36.9415294709202$$
$$x_{31} = 10.3170963923239$$
$$x_{32} = -80.9085244861295$$
$$x_{33} = -58.9221250997238$$
$$x_{34} = -93.4731949673137$$
$$x_{35} = 41.6506975235482$$
$$x_{36} = -11.872687996638$$
$$x_{37} = 88.7613865036454$$
$$x_{38} = 1.7273485883332$$
$$x_{39} = -71.4854192487808$$
$$x_{40} = 73.0559064179207$$
$$x_{41} = 54.2112640758928$$
$$x_{42} = 66.7740462827018$$
$$x_{43} = -43.2205796912713$$
$$x_{44} = 91.9025854609873$$
$$x_{45} = -24.3900702302764$$
$$x_{46} = -62.0628300193565$$
$$x_{47} = 22.8223393046639$$
$$x_{48} = -40.0808887053963$$
$$x_{49} = 98.1850597089903$$
$$x_{50} = 13.4320333317738$$
$$x_{51} = 51.0708496663407$$
$$x_{52} = -68.344488149527$$
$$x_{53} = -74.6264067711121$$
$$x_{54} = -27.5266158623553$$
$$x_{55} = -8.76741839904067$$
$$x_{56} = 82.4790796296111$$
$$x_{57} = 79.3379790102328$$
$$x_{58} = -21.2550806871871$$
$$x_{59} = -33.8025969785559$$
$$x_{60} = 60.4924658499276$$
$$x_{61} = -99.755692403974$$
$$x_{62} = -30.664226249778$$
$$x_{63} = 29.0953101555357$$
$$x_{64} = 44.7905273343624$$
$$x_{65} = -18.1224941985499$$
Signos de extremos en los puntos:
(-52.641038971595464, 73.0177688087902)
(63.63321584803859, -88.5654558201357)
(-55.78152190443925, -77.4598667088465)
(-90.33198252227811, 126.326586486416)
(47.93059280566496, 66.3548188893407)
(16.557550597883104, 21.9563883732769)
(7.227794920370989, -8.69604098426168)
(25.958184988115615, -35.2679061100517)
(-84.04964389247817, 117.441419402457)
(-65.20362174798757, 90.7866211299255)
(95.04381071233067, -132.990514295959)
(57.3518097246237, -79.6809484638514)
(-14.993903529302022, 19.7400312325434)
(-96.6144323887125, 135.211832251379)
(69.91494616442574, -97.4501925637918)
(101.3263302213222, -141.875809319407)
(-87.19079778322345, -121.883992034234)
(19.688412196735236, -26.3916504024873)
(-46.36053366605297, 64.1338989964175)
(4.227452258865565, 4.35982591422769)
(38.51116242512435, -53.0299541140155)
(-77.76744379494752, 108.556350311417)
(-2.851424298204864, 2.30374441122779)
(-49.5006996323644, -68.5757725404651)
(-5.707119115517244, -6.51155187486998)
(32.23333084418042, -44.1479779755675)
(85.62021676720221, 119.662702838957)
(76.19691948280439, -106.335101227393)
(35.3720025945026, 48.5887931125945)
(-36.94152947092023, -50.8093360363574)
(10.317096392323908, 13.1011200766066)
(-80.90852448612954, -112.998871163687)
(-58.922125099723814, 81.902049718481)
(-93.47319496731373, -130.769200535834)
(41.650697523548196, 57.4713809462824)
(-11.872687996638032, -15.3116774034849)
(88.76138650364541, -124.10528667918)
(1.7273485883331952, -0.605050114497184)
(-71.48541924878079, 99.6714054071303)
(73.0559064179207, 101.892628214931)
(54.21126407589277, 75.2388061788205)
(66.77404628270185, 93.0077996244829)
(-43.22057969127131, -59.6921755364627)
(91.9025854609873, 128.547891188419)
(-24.39007023027635, -33.0483648574995)
(-62.06283001935652, -86.3443047119278)
(22.82233930466392, 30.8290962638108)
(-40.080888705396305, 55.2506383007215)
(98.18505970899032, 137.433154198728)
(13.432033331773757, -17.5249468665677)
(51.07084966634072, -70.7967567762686)
(-68.34448814952698, -95.2289903817816)
(-74.6264067711121, -104.113860349756)
(-27.526615862355346, 37.4876717930138)
(-8.767418399040672, 10.894869717293)
(82.47907962961114, -115.220142057668)
(79.33797901023276, 110.777607108399)
(-21.255080687187064, 28.6101634090838)
(-33.80259697855595, 46.3683361149338)
(60.49246584992765, 84.1231689294035)
(-99.75569240397398, -139.654479947574)
(-30.664226249778007, -41.9277343560368)
(29.095310155535664, 39.7076244064953)
(44.790527334362366, -61.9130164897839)
(-18.122494198549877, -24.1736719122665)
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:
$$x_{1} = 63.6332158480386$$
$$x_{2} = -55.7815219044393$$
$$x_{3} = 7.22779492037099$$
$$x_{4} = 25.9581849881156$$
$$x_{5} = 95.0438107123307$$
$$x_{6} = 57.3518097246237$$
$$x_{7} = 69.9149461644257$$
$$x_{8} = 101.326330221322$$
$$x_{9} = -87.1907977832234$$
$$x_{10} = 19.6884121967352$$
$$x_{11} = 38.5111624251243$$
$$x_{12} = -49.5006996323644$$
$$x_{13} = -5.70711911551724$$
$$x_{14} = 32.2333308441804$$
$$x_{15} = 76.1969194828044$$
$$x_{16} = -36.9415294709202$$
$$x_{17} = -80.9085244861295$$
$$x_{18} = -93.4731949673137$$
$$x_{19} = -11.872687996638$$
$$x_{20} = 88.7613865036454$$
$$x_{21} = 1.7273485883332$$
$$x_{22} = -43.2205796912713$$
$$x_{23} = -24.3900702302764$$
$$x_{24} = -62.0628300193565$$
$$x_{25} = 13.4320333317738$$
$$x_{26} = 51.0708496663407$$
$$x_{27} = -68.344488149527$$
$$x_{28} = -74.6264067711121$$
$$x_{29} = 82.4790796296111$$
$$x_{30} = -99.755692403974$$
$$x_{31} = -30.664226249778$$
$$x_{32} = 44.7905273343624$$
$$x_{33} = -18.1224941985499$$
Puntos máximos de la función:
$$x_{33} = -52.6410389715955$$
$$x_{33} = -90.3319825222781$$
$$x_{33} = 47.930592805665$$
$$x_{33} = 16.5575505978831$$
$$x_{33} = -84.0496438924782$$
$$x_{33} = -65.2036217479876$$
$$x_{33} = -14.993903529302$$
$$x_{33} = -96.6144323887125$$
$$x_{33} = -46.360533666053$$
$$x_{33} = 4.22745225886556$$
$$x_{33} = -77.7674437949475$$
$$x_{33} = -2.85142429820486$$
$$x_{33} = 85.6202167672022$$
$$x_{33} = 35.3720025945026$$
$$x_{33} = 10.3170963923239$$
$$x_{33} = -58.9221250997238$$
$$x_{33} = 41.6506975235482$$
$$x_{33} = -71.4854192487808$$
$$x_{33} = 73.0559064179207$$
$$x_{33} = 54.2112640758928$$
$$x_{33} = 66.7740462827018$$
$$x_{33} = 91.9025854609873$$
$$x_{33} = 22.8223393046639$$
$$x_{33} = -40.0808887053963$$
$$x_{33} = 98.1850597089903$$
$$x_{33} = -27.5266158623553$$
$$x_{33} = -8.76741839904067$$
$$x_{33} = 79.3379790102328$$
$$x_{33} = -21.2550806871871$$
$$x_{33} = -33.8025969785559$$
$$x_{33} = 60.4924658499276$$
$$x_{33} = 29.0953101555357$$
Decrece en los intervalos
$$\left[101.326330221322, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -99.755692403974\right]$$