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$$- \frac{\sin{\left(x \right)}}{\sqrt{x}} - \frac{\cos{\left(x \right)}}{2 x^{\frac{3}{2}}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -28.2566407733299$$
$$x_{2} = -47.1132774827275$$
$$x_{3} = 34.5430455066495$$
$$x_{4} = 87.9589098892909$$
$$x_{5} = -75.3915917440781$$
$$x_{6} = -81.6752872670354$$
$$x_{7} = -9.37147510585595$$
$$x_{8} = 62.8238944845809$$
$$x_{9} = -2.97508632168828$$
$$x_{10} = -100.525991117835$$
$$x_{11} = -131.94310195667$$
$$x_{12} = 21.9683925318703$$
$$x_{13} = -12.5264763376692$$
$$x_{14} = -62.8238944845809$$
$$x_{15} = 1683.89336539322$$
$$x_{16} = -34.5430455066495$$
$$x_{17} = -40.8284587489214$$
$$x_{18} = -69.1078034322536$$
$$x_{19} = 791.680717136973$$
$$x_{20} = 2.97508632168828$$
$$x_{21} = 53.397711687542$$
$$x_{22} = 50.2555336325565$$
$$x_{23} = -21.9683925318703$$
$$x_{24} = 40.8284587489214$$
$$x_{25} = 94.2424741940464$$
$$x_{26} = -84.817106677999$$
$$x_{27} = 81.6752872670354$$
$$x_{28} = -72.2497107001058$$
$$x_{29} = 25.1128337203766$$
$$x_{30} = -37.6858450405302$$
$$x_{31} = -18.8229989180076$$
$$x_{32} = 179.067989026352$$
$$x_{33} = -15.6760783451944$$
$$x_{34} = 6.20274981679304$$
$$x_{35} = 31.4000043168626$$
$$x_{36} = 75.3915917440781$$
$$x_{37} = 56.5398246709304$$
$$x_{38} = -6.20274981679304$$
$$x_{39} = 28.2566407733299$$
$$x_{40} = 72.2497107001058$$
$$x_{41} = -56.5398246709304$$
$$x_{42} = 84.817106677999$$
$$x_{43} = -87.9589098892909$$
$$x_{44} = 100.525991117835$$
$$x_{45} = 12.5264763376692$$
$$x_{46} = 15.6760783451944$$
$$x_{47} = 18.8229989180076$$
$$x_{48} = -91.1006985770946$$
$$x_{49} = -43.9709264903445$$
$$x_{50} = 65.9658661929102$$
$$x_{51} = -188.492906601895$$
$$x_{52} = 78.5334497119428$$
$$x_{53} = -25.1128337203766$$
$$x_{54} = 9.37147510585595$$
$$x_{55} = -1146.6808825192$$
$$x_{56} = -97.3842380053013$$
$$x_{57} = -53.397711687542$$
$$x_{58} = -59.6818828624266$$
$$x_{59} = 47.1132774827275$$
$$x_{60} = -50.2555336325565$$
$$x_{61} = 69.1078034322536$$
$$x_{62} = 91.1006985770946$$
$$x_{63} = -31.4000043168626$$
$$x_{64} = 37.6858450405302$$
$$x_{65} = 43.9709264903445$$
$$x_{66} = -94.2424741940464$$
$$x_{67} = -65.9658661929102$$
$$x_{68} = 59.6818828624266$$
$$x_{69} = 97.3842380053013$$
$$x_{70} = -78.5334497119428$$
Signos de extremos en los puntos:
(-28.256640773329945, 0.18809261922504*I)
(-47.11327748272753, 0.145681325876889*I)
(34.54304550664949, -0.170127373179912)
(87.95890988929088, 0.106623531852143)
(-75.39159174407808, -0.115167248976248*I)
(-81.67528726703536, -0.110648753785148*I)
(-9.371475105855954, 0.326196105910348*I)
(62.82389448458093, 0.126160621108934)
(-2.9750863216882792, 0.571744401877857*I)
(-100.52599111783519, -0.0997368037242384*I)
(-131.94310195666966, -0.0870569678200158*I)
(21.968392531870297, -0.213298795668094)
(-12.5264763376692, -0.282318830106324*I)
(-62.82389448458093, -0.126160621108934*I)
(1683.8933653932215, 0.0243692794377349)
(-34.54304550664949, 0.170127373179912*I)
(-40.8284587489214, 0.15648976674518*I)
(-69.10780343225363, -0.120288771309422*I)
(791.6807171369735, 0.035540610191994)
(2.9750863216882792, -0.571744401877857)
(53.39771168754203, -0.136842071089773)
(50.255533632556485, 0.141054375396673)
(-21.968392531870297, 0.213298795668094*I)
(40.8284587489214, -0.15648976674518)
(94.24247419404638, 0.103007903504495)
(-84.817106677999, 0.108580222480823*I)
(81.67528726703536, 0.110648753785148)
(-72.24971070010584, 0.117644477250395*I)
(25.112833720376596, 0.199510646718215)
(-37.68584504053022, -0.16288183381049*I)
(-18.822998918007553, -0.230410584140235*I)
(179.06798902635177, -0.0747290272027069)
(-15.676078345194368, 0.252441346243332*I)
(6.202749816793043, 0.400222440722691)
(31.400004316862624, 0.178435019744746)
(75.39159174407808, 0.115167248976248)
(56.53982467093041, 0.132985959193641)
(-6.202749816793043, -0.400222440722691*I)
(28.256640773329945, -0.18809261922504)
(72.24971070010584, -0.117644477250395)
(-56.53982467093041, -0.132985959193641*I)
(84.817106677999, -0.108580222480823)
(-87.95890988929088, -0.106623531852143*I)
(100.52599111783519, 0.0997368037242384)
(12.5264763376692, 0.282318830106324)
(15.676078345194368, -0.252441346243332)
(18.822998918007553, 0.230410584140235)
(-91.10069857709462, 0.104768953369684*I)
(-43.97092649034452, -0.150795754903091*I)
(65.96586619291024, -0.123119796833232)
(-188.49290660189519, -0.0728368182892935*I)
(78.53344971194282, -0.112840203476897)
(-25.112833720376596, -0.199510646718215*I)
(9.371475105855954, -0.326196105910348)
(-1146.6808825191963, 0.0295310352979044*I)
(-97.38423800530128, 0.101332776087448*I)
(-53.39771168754203, 0.136842071089773*I)
(-59.681882862426576, 0.129438509013877*I)
(47.11327748272753, -0.145681325876889)
(-50.255533632556485, -0.141054375396673*I)
(69.10780343225363, 0.120288771309422)
(91.10069857709462, -0.104768953369684)
(-31.400004316862624, -0.178435019744746*I)
(37.68584504053022, 0.16288183381049)
(43.97092649034452, 0.150795754903091)
(-94.24247419404638, -0.103007903504495*I)
(-65.96586619291024, 0.123119796833232*I)
(59.681882862426576, -0.129438509013877)
(97.38423800530128, -0.101332776087448)
(-78.53344971194282, 0.112840203476897*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:
$$x_{1} = 34.5430455066495$$
$$x_{2} = 21.9683925318703$$
$$x_{3} = 2.97508632168828$$
$$x_{4} = 53.397711687542$$
$$x_{5} = 40.8284587489214$$
$$x_{6} = 179.067989026352$$
$$x_{7} = 28.2566407733299$$
$$x_{8} = 72.2497107001058$$
$$x_{9} = 84.817106677999$$
$$x_{10} = 15.6760783451944$$
$$x_{11} = 65.9658661929102$$
$$x_{12} = 78.5334497119428$$
$$x_{13} = 9.37147510585595$$
$$x_{14} = 47.1132774827275$$
$$x_{15} = 91.1006985770946$$
$$x_{16} = 59.6818828624266$$
$$x_{17} = 97.3842380053013$$
Puntos máximos de la función:
$$x_{17} = 87.9589098892909$$
$$x_{17} = 62.8238944845809$$
$$x_{17} = 1683.89336539322$$
$$x_{17} = 791.680717136973$$
$$x_{17} = 50.2555336325565$$
$$x_{17} = 94.2424741940464$$
$$x_{17} = 81.6752872670354$$
$$x_{17} = 25.1128337203766$$
$$x_{17} = 6.20274981679304$$
$$x_{17} = 31.4000043168626$$
$$x_{17} = 75.3915917440781$$
$$x_{17} = 56.5398246709304$$
$$x_{17} = 100.525991117835$$
$$x_{17} = 12.5264763376692$$
$$x_{17} = 18.8229989180076$$
$$x_{17} = 69.1078034322536$$
$$x_{17} = 37.6858450405302$$
$$x_{17} = 43.9709264903445$$
Decrece en los intervalos
$$\left[179.067989026352, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 2.97508632168828\right]$$