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$$- \frac{\sin{\left(x \right)}}{x} - \frac{\cos{\left(x \right)} + 1}{x^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -50.2256674407532$$
$$x_{2} = -87.941852980689$$
$$x_{3} = 25.0529526753384$$
$$x_{4} = 84.8230016469244$$
$$x_{5} = 47.1238898038469$$
$$x_{6} = 100.511067265113$$
$$x_{7} = -53.4070751110265$$
$$x_{8} = -37.6459978360151$$
$$x_{9} = 91.106186954104$$
$$x_{10} = -84.8230016469244$$
$$x_{11} = 5.95017264337656$$
$$x_{12} = -3.14159265358979$$
$$x_{13} = -69.086091013299$$
$$x_{14} = 87.941852980689$$
$$x_{15} = -279.601746169492$$
$$x_{16} = -40.8407044966673$$
$$x_{17} = 62.8000086337252$$
$$x_{18} = -62.8000086337252$$
$$x_{19} = -100.511067265113$$
$$x_{20} = -12.4054996335861$$
$$x_{21} = 78.5398163397448$$
$$x_{22} = 477.51789502706$$
$$x_{23} = -18.7429502117119$$
$$x_{24} = -9.42477796076938$$
$$x_{25} = 94.2265549654551$$
$$x_{26} = 72.2566310325652$$
$$x_{27} = 56.5132815466599$$
$$x_{28} = 9.42477796076938$$
$$x_{29} = 43.9367850637406$$
$$x_{30} = 40.8407044966673$$
$$x_{31} = 59.6902604182061$$
$$x_{32} = -25.0529526753384$$
$$x_{33} = -91.106186954104$$
$$x_{34} = 97.3893722612836$$
$$x_{35} = 34.5575191894877$$
$$x_{36} = 75.3716900810604$$
$$x_{37} = -78.5398163397448$$
$$x_{38} = 37.6459978360151$$
$$x_{39} = 31.3521566903887$$
$$x_{40} = 779.112411068009$$
$$x_{41} = 81.6569174978428$$
$$x_{42} = -65.9734457253857$$
$$x_{43} = -43.9367850637406$$
$$x_{44} = 12.4054996335861$$
$$x_{45} = 3.14159265358979$$
$$x_{46} = 15.707963267949$$
$$x_{47} = -31.3521566903887$$
$$x_{48} = -21.9911485751286$$
$$x_{49} = 18.7429502117119$$
$$x_{50} = -15.707963267949$$
$$x_{51} = 69.086091013299$$
$$x_{52} = 128.805298797182$$
$$x_{53} = -94.2265549654551$$
$$x_{54} = 28.2743338823081$$
$$x_{55} = -59.6902604182061$$
$$x_{56} = -408.402147842567$$
$$x_{57} = -81.6569174978428$$
$$x_{58} = -97.3893722612836$$
$$x_{59} = 21.9911485751286$$
$$x_{60} = 65.9734457253857$$
$$x_{61} = -34.5575191894877$$
$$x_{62} = -72.2566310325652$$
$$x_{63} = 50.2256674407532$$
$$x_{64} = -75.3716900810604$$
$$x_{65} = -28.2743338823081$$
$$x_{66} = -56.5132815466599$$
$$x_{67} = -5.95017264337656$$
$$x_{68} = 53.4070751110265$$
$$x_{69} = -47.1238898038469$$
Signos de extremos en los puntos:
(-50.22566744075319, -0.0398044981539202)
(-87.94185298068903, -0.022739359696793)
(25.0529526753384, 0.0797039218326035)
(84.82300164692441, 0)
(47.1238898038469, 0)
(100.51106726511297, 0.0198963368185454)
(-53.40707511102649, 0)
(-37.645997836015106, -0.0530890372838442)
(91.106186954104, 0)
(-84.82300164692441, 0)
(5.9501726433765585, 0.326891661078669)
(-3.141592653589793, 0)
(-69.08609101329898, -0.028943323105097)
(87.94185298068903, 0.022739359696793)
(-279.6017461694916, 0)
(-40.840704496667314, 0)
(62.80000863372525, 0.0318390562713079)
(-62.80000863372525, -0.0318390562713079)
(-100.51106726511297, -0.0198963368185454)
(-12.405499633586086, -0.160178002058028)
(78.53981633974483, 0)
(477.5178950270596, 0.00418830634377207)
(-18.742950211711907, -0.106403899511075)
(-9.42477796076938, 0)
(94.22655496545507, 0.0212230487092482)
(72.25663103256524, 0)
(56.51328154665989, 0.0353788334069361)
(9.42477796076938, 0)
(43.936785063740594, 0.0454963762334591)
(40.840704496667314, 0)
(59.69026041820607, 0)
(-25.0529526753384, -0.0797039218326035)
(-91.106186954104, 0)
(97.3893722612836, 0)
(34.55751918948773, 0)
(75.37169008106044, 0.026530491785468)
(-78.53981633974483, 0)
(37.645997836015106, 0.0530890372838442)
(31.352156690388735, 0.0637266332931457)
(779.1124110680094, 0.0025670194400556)
(81.6569174978428, 0.0244890470959608)
(-65.97344572538566, 0)
(-43.936785063740594, -0.0454963762334591)
(12.405499633586086, 0.160178002058028)
(3.141592653589793, 0)
(15.707963267948966, 0)
(-31.352156690388735, -0.0637266332931457)
(-21.991148575128552, 0)
(18.742950211711907, 0.106403899511075)
(-15.707963267948966, 0)
(69.08609101329898, 0.028943323105097)
(128.80529879718154, 0)
(-94.22655496545507, -0.0212230487092482)
(28.274333882308138, 0)
(-59.69026041820607, 0)
(-408.4021478425674, -0.00489710453208163)
(-81.6569174978428, -0.0244890470959608)
(-97.3893722612836, 0)
(21.991148575128552, 0)
(65.97344572538566, 0)
(-34.55751918948773, 0)
(-72.25663103256524, 0)
(50.22566744075319, 0.0398044981539202)
(-75.37169008106044, -0.026530491785468)
(-28.274333882308138, 0)
(-56.51328154665989, -0.0353788334069361)
(-5.9501726433765585, -0.326891661078669)
(53.40707511102649, 0)
(-47.1238898038469, 0)
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:
$$x_{1} = -50.2256674407532$$
$$x_{2} = -87.941852980689$$
$$x_{3} = 84.8230016469244$$
$$x_{4} = 47.1238898038469$$
$$x_{5} = -37.6459978360151$$
$$x_{6} = 91.106186954104$$
$$x_{7} = -69.086091013299$$
$$x_{8} = -62.8000086337252$$
$$x_{9} = -100.511067265113$$
$$x_{10} = -12.4054996335861$$
$$x_{11} = 78.5398163397448$$
$$x_{12} = -18.7429502117119$$
$$x_{13} = 72.2566310325652$$
$$x_{14} = 9.42477796076938$$
$$x_{15} = 40.8407044966673$$
$$x_{16} = 59.6902604182061$$
$$x_{17} = -25.0529526753384$$
$$x_{18} = 97.3893722612836$$
$$x_{19} = 34.5575191894877$$
$$x_{20} = -43.9367850637406$$
$$x_{21} = 3.14159265358979$$
$$x_{22} = 15.707963267949$$
$$x_{23} = -31.3521566903887$$
$$x_{24} = 128.805298797182$$
$$x_{25} = -94.2265549654551$$
$$x_{26} = 28.2743338823081$$
$$x_{27} = -408.402147842567$$
$$x_{28} = -81.6569174978428$$
$$x_{29} = 21.9911485751286$$
$$x_{30} = 65.9734457253857$$
$$x_{31} = -75.3716900810604$$
$$x_{32} = -56.5132815466599$$
$$x_{33} = -5.95017264337656$$
$$x_{34} = 53.4070751110265$$
Puntos máximos de la función:
$$x_{34} = 25.0529526753384$$
$$x_{34} = 100.511067265113$$
$$x_{34} = -53.4070751110265$$
$$x_{34} = -84.8230016469244$$
$$x_{34} = 5.95017264337656$$
$$x_{34} = -3.14159265358979$$
$$x_{34} = 87.941852980689$$
$$x_{34} = -279.601746169492$$
$$x_{34} = -40.8407044966673$$
$$x_{34} = 62.8000086337252$$
$$x_{34} = 477.51789502706$$
$$x_{34} = -9.42477796076938$$
$$x_{34} = 94.2265549654551$$
$$x_{34} = 56.5132815466599$$
$$x_{34} = 43.9367850637406$$
$$x_{34} = -91.106186954104$$
$$x_{34} = 75.3716900810604$$
$$x_{34} = -78.5398163397448$$
$$x_{34} = 37.6459978360151$$
$$x_{34} = 31.3521566903887$$
$$x_{34} = 779.112411068009$$
$$x_{34} = 81.6569174978428$$
$$x_{34} = -65.9734457253857$$
$$x_{34} = 12.4054996335861$$
$$x_{34} = -21.9911485751286$$
$$x_{34} = 18.7429502117119$$
$$x_{34} = -15.707963267949$$
$$x_{34} = 69.086091013299$$
$$x_{34} = -59.6902604182061$$
$$x_{34} = -97.3893722612836$$
$$x_{34} = -34.5575191894877$$
$$x_{34} = -72.2566310325652$$
$$x_{34} = 50.2256674407532$$
$$x_{34} = -28.2743338823081$$
$$x_{34} = -47.1238898038469$$
Decrece en los intervalos
$$\left[128.805298797182, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -408.402147842567\right]$$