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$$- \frac{1}{2 \sqrt{x}} \sin{\left(x \right)} - \sqrt{x} \cos{\left(x \right)} - \frac{\sin{\left(x \right)}}{2 \sqrt{x}} - \frac{\cos{\left(x \right)}}{4 x^{\frac{3}{2}}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -36.1559611393004$$
$$x_{2} = -48.7152085571549$$
$$x_{3} = 70.6999773315004$$
$$x_{4} = -39.2953468672842$$
$$x_{5} = 23.6042658400483$$
$$x_{6} = -124.100967466518$$
$$x_{7} = 14.2073505099925$$
$$x_{8} = 2.0090972384408$$
$$x_{9} = -80.1230923289863$$
$$x_{10} = 83.2642142711524$$
$$x_{11} = 20.4691384083001$$
$$x_{12} = -83.2642142711524$$
$$x_{13} = -64.4181707871237$$
$$x_{14} = -92.6877714581404$$
$$x_{15} = -58.136661973445$$
$$x_{16} = -23.6042658400483$$
$$x_{17} = -17.3363302997334$$
$$x_{18} = 7.97819025123437$$
$$x_{19} = 80.1230923289863$$
$$x_{20} = 26.7409029817025$$
$$x_{21} = -14.2073505099925$$
$$x_{22} = 42.4350586138523$$
$$x_{23} = -7.97819025123437$$
$$x_{24} = 17.3363302997334$$
$$x_{25} = -86.4053704242642$$
$$x_{26} = -42.4350586138523$$
$$x_{27} = -76.9820087826371$$
$$x_{28} = 4.91125081295869$$
$$x_{29} = 48.7152085571549$$
$$x_{30} = 76.9820087826371$$
$$x_{31} = 61.2773734476957$$
$$x_{32} = 58.136661973445$$
$$x_{33} = 54.9960510556604$$
$$x_{34} = 89.5465571901753$$
$$x_{35} = -11.0853581860961$$
$$x_{36} = 39.2953468672842$$
$$x_{37} = -29.8785771570692$$
$$x_{38} = -2.0090972384408$$
$$x_{39} = 92.6877714581404$$
$$x_{40} = -51.8555589377593$$
$$x_{41} = -70.6999773315004$$
$$x_{42} = -67.559042028453$$
$$x_{43} = 51.8555589377593$$
$$x_{44} = -45.5750291575042$$
$$x_{45} = 67.559042028453$$
$$x_{46} = 36.1559611393004$$
$$x_{47} = -4.91125081295869$$
$$x_{48} = 95.8290105250036$$
$$x_{49} = -20.4691384083001$$
$$x_{50} = -95.8290105250036$$
$$x_{51} = 73.8409685283396$$
$$x_{52} = -33.0169941017832$$
$$x_{53} = -26.7409029817025$$
$$x_{54} = 45.5750291575042$$
$$x_{55} = 33.0169941017832$$
$$x_{56} = 29.8785771570692$$
$$x_{57} = 11.0853581860961$$
$$x_{58} = -98.9702720305701$$
$$x_{59} = -73.8409685283396$$
$$x_{60} = 98.9702720305701$$
$$x_{61} = -133.525176756856$$
$$x_{62} = -89.5465571901753$$
$$x_{63} = 86.4053704242642$$
$$x_{64} = -61.2773734476957$$
$$x_{65} = 64.4181707871237$$
$$x_{66} = -54.9960510556604$$
Signos de extremos en los puntos:
(-36.15596113930037, -6.012983594342*I)
(-48.715208557154924, -6.97962841986057*I)
(70.6999773315004, -8.40832793996118)
(-39.29534686728419, 6.26860072900286*I)
(23.604265840048264, 4.85842605755917)
(-124.10096746651843, -11.140061387986*I)
(14.20735050999248, -3.76928687912344)
(2.009097238440804, -1.43315125662761)
(-80.12309232898626, -8.95115038980062*I)
(83.26421427115243, -9.12492274691236)
(20.469138408300097, -4.52428961282046)
(-83.26421427115243, 9.12492274691236*I)
(-64.4181707871237, 8.0260932374906*I)
(-92.68777145814039, -9.62744888773492*I)
(-58.13666197344501, 7.62474029176846*I)
(-23.604265840048264, -4.85842605755917*I)
(-17.33633029973344, -4.16370337379293*I)
(7.978190251234368, -2.82473930857575)
(80.12309232898626, 8.95115038980062)
(26.74090298170248, -5.17116322263798)
(-14.20735050999248, 3.76928687912344*I)
(42.43505861385231, 6.51422022591249)
(-7.978190251234368, 2.82473930857575*I)
(17.33633029973344, 4.16370337379293)
(-86.40537042426418, -9.29544895092167*I)
(-42.43505861385231, -6.51422022591249*I)
(-76.98200878263714, 8.77393924519306*I)
(4.911250812958692, 2.21703046556035)
(48.715208557154924, 6.97962841986057)
(76.98200878263714, -8.77393924519306)
(61.277373447695695, 7.82798669006771)
(58.13666197344501, -7.62474029176846)
(54.99605105566035, 7.41593244710852)
(89.54655719017528, -9.46290430504231)
(-11.08535818609612, -3.32952260910702*I)
(39.29534686728419, -6.26860072900286)
(-29.87857715706918, -5.46613170997848*I)
(-2.009097238440804, 1.43315125662761*I)
(92.68777145814039, 9.62744888773492)
(-51.85555893775929, 7.20108064956528*I)
(-70.6999773315004, 8.40832793996118*I)
(-67.55904202845302, -8.21943085921586*I)
(51.85555893775929, -7.20108064956528)
(-45.57502915750418, 6.75092841286144*I)
(67.55904202845302, 8.21943085921586)
(36.15596113930037, 6.012983594342)
(-4.911250812958692, -2.21703046556035*I)
(95.82901052500361, -9.78922934112189)
(-20.469138408300097, 4.52428961282046*I)
(-95.82901052500361, 9.78922934112189*I)
(73.84096852833959, 8.59307685115599)
(-33.01699410178322, 5.74604281000918*I)
(-26.74090298170248, 5.17116322263798*I)
(45.57502915750418, -6.75092841286144)
(33.01699410178322, -5.74604281000918)
(29.87857715706918, 5.46613170997848)
(11.08535818609612, 3.32952260910702)
(-98.97027203057014, -9.94838039814827*I)
(-73.84096852833959, -8.59307685115599*I)
(98.97027203057014, 9.94838039814827)
(-133.5251767568555, 11.5553094708393*I)
(-89.54655719017528, 9.46290430504231*I)
(86.40537042426418, 9.29544895092167)
(-61.277373447695695, -7.82798669006771*I)
(64.4181707871237, -8.0260932374906)
(-54.99605105566035, -7.41593244710852*I)
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:
$$x_{1} = 70.6999773315004$$
$$x_{2} = 14.2073505099925$$
$$x_{3} = 2.0090972384408$$
$$x_{4} = 83.2642142711524$$
$$x_{5} = 20.4691384083001$$
$$x_{6} = 7.97819025123437$$
$$x_{7} = 26.7409029817025$$
$$x_{8} = 76.9820087826371$$
$$x_{9} = 58.136661973445$$
$$x_{10} = 89.5465571901753$$
$$x_{11} = 39.2953468672842$$
$$x_{12} = 51.8555589377593$$
$$x_{13} = 95.8290105250036$$
$$x_{14} = 45.5750291575042$$
$$x_{15} = 33.0169941017832$$
$$x_{16} = 64.4181707871237$$
Puntos máximos de la función:
$$x_{16} = 23.6042658400483$$
$$x_{16} = 80.1230923289863$$
$$x_{16} = 42.4350586138523$$
$$x_{16} = 17.3363302997334$$
$$x_{16} = 4.91125081295869$$
$$x_{16} = 48.7152085571549$$
$$x_{16} = 61.2773734476957$$
$$x_{16} = 54.9960510556604$$
$$x_{16} = 92.6877714581404$$
$$x_{16} = 67.559042028453$$
$$x_{16} = 36.1559611393004$$
$$x_{16} = 73.8409685283396$$
$$x_{16} = 29.8785771570692$$
$$x_{16} = 11.0853581860961$$
$$x_{16} = 98.9702720305701$$
$$x_{16} = 86.4053704242642$$
Decrece en los intervalos
$$\left[95.8290105250036, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 2.0090972384408\right]$$