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$$\left(2 x + 1\right) \cos{\left(x \right)} + 2 \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 39.2950316476879$$
$$x_{2} = 92.6877138973701$$
$$x_{3} = -7.98676475119172$$
$$x_{4} = -33.0174658775265$$
$$x_{5} = 67.5589341430727$$
$$x_{6} = -67.5591531543674$$
$$x_{7} = -80.1231711644351$$
$$x_{8} = 7.97148100902349$$
$$x_{9} = 76.9819255322054$$
$$x_{10} = 83.2641430354848$$
$$x_{11} = -95.829065529839$$
$$x_{12} = 58.1365166573738$$
$$x_{13} = -39.2956785303244$$
$$x_{14} = -83.2642872382528$$
$$x_{15} = -26.7416265193495$$
$$x_{16} = 80.123015436615$$
$$x_{17} = -11.0897262388501$$
$$x_{18} = 20.4680078422429$$
$$x_{19} = 29.8780368458978$$
$$x_{20} = 54.9958888407247$$
$$x_{21} = -64.4182930958041$$
$$x_{22} = 95.8289566560771$$
$$x_{23} = -92.6878302742345$$
$$x_{24} = 89.5464955446878$$
$$x_{25} = 51.8553766970605$$
$$x_{26} = 4.89564432915531$$
$$x_{27} = 26.7402314854239$$
$$x_{28} = 48.7150023424838$$
$$x_{29} = 42.4347877496486$$
$$x_{30} = -36.1563536592178$$
$$x_{31} = -70.700078740623$$
$$x_{32} = 36.1555897201517$$
$$x_{33} = -4.93419822854993$$
$$x_{34} = -20.4703846071522$$
$$x_{35} = 61.2772425220152$$
$$x_{36} = 17.3347711916489$$
$$x_{37} = -29.8791548121049$$
$$x_{38} = 23.6034090301611$$
$$x_{39} = -14.2099775813926$$
$$x_{40} = 33.0165500205799$$
$$x_{41} = -76.9820942237331$$
$$x_{42} = -42.4353425392198$$
$$x_{43} = -45.5752749499286$$
$$x_{44} = 105.252809626976$$
$$x_{45} = 86.4053042434102$$
$$x_{46} = -86.4054381545562$$
$$x_{47} = -54.9962192754584$$
$$x_{48} = -48.715423408888$$
$$x_{49} = 70.699878750109$$
$$x_{50} = 45.5747939110765$$
$$x_{51} = -73.8410614412353$$
$$x_{52} = 1.95728275422062$$
$$x_{53} = 11.0817037582484$$
$$x_{54} = -61.2775087154266$$
$$x_{55} = 98.9702215094204$$
$$x_{56} = -98.9703235828905$$
$$x_{57} = -89.5466202277414$$
$$x_{58} = -23.6051982121417$$
$$x_{59} = -58.1368123734526$$
$$x_{60} = -0.247412484885142$$
$$x_{61} = -17.3380791158534$$
$$x_{62} = 14.2050661771509$$
$$x_{63} = 64.4180522161792$$
$$x_{64} = 73.8408780976001$$
$$x_{65} = -2.12300090681457$$
$$x_{66} = -51.8557483406994$$
Signos de extremos en los puntos:
(39.29503164768789, 79.5649464248379)
(92.68771389737012, -186.364697693097)
(-7.986764751191716, 14.8417215197729)
(-33.01746587752653, 65.0042008467558)
(67.5589341430727, -136.103177516664)
(-67.55915315436735, -134.103396587937)
(-80.12317116443509, -159.233784656253)
(7.971481009023492, 16.8261383769496)
(76.98192553220542, 154.950946440755)
(83.26414303548475, 167.516349064459)
(-95.82906552983897, 190.647641945238)
(58.13651665737381, 117.255982814905)
(-39.2956785303244, 77.5655938310989)
(-83.2642872382528, 165.516493293226)
(-26.741626519349484, 52.4451870984841)
(80.12301543661505, -161.233628898112)
(-11.089726238850124, -21.0856482225243)
(20.46800784224292, 41.8884051837394)
(29.878036845897785, -60.7231819016979)
(54.995888840724724, -110.973762715585)
(-64.41829309580406, 127.820944089557)
(95.8289566560771, 192.647533056656)
(-92.68783027423446, -184.364814086894)
(89.54649554468782, 180.081886742599)
(51.85537669706051, 104.691658383599)
(4.895644329155311, -10.6105958362832)
(26.740231485423934, 54.4437896263579)
(48.715002342483764, -98.4096919670489)
(42.4347877496486, -85.8462938347437)
(-36.156353659217835, -71.2846783594538)
(-70.70007874062303, 140.385914650559)
(36.15558972015174, -73.283913689973)
(-4.934198228549927, -8.65112979640719)
(-20.470384607152152, 39.8907890373943)
(61.2772425220152, -123.538301033815)
(17.334771191648883, -35.6136040006033)
(-29.879154812104865, -58.7243014330717)
(23.60340903016115, -48.165383634478)
(-14.209977581392641, 27.3473053378206)
(33.016550020579906, 67.0032839397468)
(-76.98209422373313, 152.951115167863)
(-42.43534253921977, -83.8468490094031)
(-45.575274949928605, 90.1283729743018)
(105.25280962697555, -211.496163874502)
(86.40530424341024, -173.799102851863)
(-86.40543815455618, -171.799236785429)
(-54.99621927545844, -108.974093286877)
(-48.71542340888797, -96.4101132552267)
(70.69987875010902, 142.385714610033)
(45.5747939110765, 92.1278916459743)
(-73.84106144123533, -146.668489856598)
(1.9572827542206206, 4.55206306571846)
(11.081703758248404, -23.0775442284508)
(-61.27750871542658, -121.538567315839)
(98.9702215094204, -198.930390520815)
(-98.97032358289053, -196.930492607311)
(-89.54662022774141, 178.082011445089)
(-23.605198212141747, -46.1671768296396)
(-58.13681237345261, 115.256278640346)
(-0.2474124848851423, -0.123715373656181)
(-17.338079115853432, -33.6169256769223)
(14.20506617715089, 29.3423635380666)
(64.41805221617925, 129.820703137375)
(73.8408780976001, -148.668306470931)
(-2.123000906814568, 2.76354903624568)
(-51.85574834069936, 102.692030199991)
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:
$$x_{1} = 92.6877138973701$$
$$x_{2} = 67.5589341430727$$
$$x_{3} = -67.5591531543674$$
$$x_{4} = -80.1231711644351$$
$$x_{5} = 80.123015436615$$
$$x_{6} = -11.0897262388501$$
$$x_{7} = 29.8780368458978$$
$$x_{8} = 54.9958888407247$$
$$x_{9} = -92.6878302742345$$
$$x_{10} = 4.89564432915531$$
$$x_{11} = 48.7150023424838$$
$$x_{12} = 42.4347877496486$$
$$x_{13} = -36.1563536592178$$
$$x_{14} = 36.1555897201517$$
$$x_{15} = -4.93419822854993$$
$$x_{16} = 61.2772425220152$$
$$x_{17} = 17.3347711916489$$
$$x_{18} = -29.8791548121049$$
$$x_{19} = 23.6034090301611$$
$$x_{20} = -42.4353425392198$$
$$x_{21} = 105.252809626976$$
$$x_{22} = 86.4053042434102$$
$$x_{23} = -86.4054381545562$$
$$x_{24} = -54.9962192754584$$
$$x_{25} = -48.715423408888$$
$$x_{26} = -73.8410614412353$$
$$x_{27} = 11.0817037582484$$
$$x_{28} = -61.2775087154266$$
$$x_{29} = 98.9702215094204$$
$$x_{30} = -98.9703235828905$$
$$x_{31} = -23.6051982121417$$
$$x_{32} = -0.247412484885142$$
$$x_{33} = -17.3380791158534$$
$$x_{34} = 73.8408780976001$$
Puntos máximos de la función:
$$x_{34} = 39.2950316476879$$
$$x_{34} = -7.98676475119172$$
$$x_{34} = -33.0174658775265$$
$$x_{34} = 7.97148100902349$$
$$x_{34} = 76.9819255322054$$
$$x_{34} = 83.2641430354848$$
$$x_{34} = -95.829065529839$$
$$x_{34} = 58.1365166573738$$
$$x_{34} = -39.2956785303244$$
$$x_{34} = -83.2642872382528$$
$$x_{34} = -26.7416265193495$$
$$x_{34} = 20.4680078422429$$
$$x_{34} = -64.4182930958041$$
$$x_{34} = 95.8289566560771$$
$$x_{34} = 89.5464955446878$$
$$x_{34} = 51.8553766970605$$
$$x_{34} = 26.7402314854239$$
$$x_{34} = -70.700078740623$$
$$x_{34} = -20.4703846071522$$
$$x_{34} = -14.2099775813926$$
$$x_{34} = 33.0165500205799$$
$$x_{34} = -76.9820942237331$$
$$x_{34} = -45.5752749499286$$
$$x_{34} = 70.699878750109$$
$$x_{34} = 45.5747939110765$$
$$x_{34} = 1.95728275422062$$
$$x_{34} = -89.5466202277414$$
$$x_{34} = -58.1368123734526$$
$$x_{34} = 14.2050661771509$$
$$x_{34} = 64.4180522161792$$
$$x_{34} = -2.12300090681457$$
$$x_{34} = -51.8557483406994$$
Decrece en los intervalos
$$\left[105.252809626976, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -98.9703235828905\right]$$