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$$\frac{\sin{\left(x \right)}}{x} - \frac{1 - \cos{\left(x \right)}}{x^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 43.9822971502571$$
$$x_{2} = -43.9822971502571$$
$$x_{3} = -2.33112237041442$$
$$x_{4} = 81.6814089933346$$
$$x_{5} = -31.4159265358979$$
$$x_{6} = -28.2034502671317$$
$$x_{7} = -84.7994176724893$$
$$x_{8} = -25.1327412287183$$
$$x_{9} = 34.4995636692158$$
$$x_{10} = 65.943118880897$$
$$x_{11} = -34.4995636692158$$
$$x_{12} = -94.2477796076938$$
$$x_{13} = 6.28318530717959$$
$$x_{14} = 84.7994176724893$$
$$x_{15} = 97.3688325296866$$
$$x_{16} = -50.2654824574367$$
$$x_{17} = -21.8998872970823$$
$$x_{18} = -75.398223686155$$
$$x_{19} = -9.20843355440115$$
$$x_{20} = -1181.23883774976$$
$$x_{21} = -53.3696049818501$$
$$x_{22} = -56.5486677646163$$
$$x_{23} = -40.7916847146183$$
$$x_{24} = 50.2654824574367$$
$$x_{25} = -307.8760800518$$
$$x_{26} = -69.1150383789755$$
$$x_{27} = -100.530964914873$$
$$x_{28} = -97.3688325296866$$
$$x_{29} = 91.0842301384618$$
$$x_{30} = 2.33112237041442$$
$$x_{31} = 56.5486677646163$$
$$x_{32} = -62.8318530717959$$
$$x_{33} = -87.9645943005142$$
$$x_{34} = 18.8495559215388$$
$$x_{35} = -91.0842301384618$$
$$x_{36} = 100.530964914873$$
$$x_{37} = -65.943118880897$$
$$x_{38} = 62.8318530717959$$
$$x_{39} = 94.2477796076938$$
$$x_{40} = 12.5663706143592$$
$$x_{41} = -103.653263067797$$
$$x_{42} = 92394.2399420758$$
$$x_{43} = 47.0814165846103$$
$$x_{44} = 169.646003293849$$
$$x_{45} = -47.0814165846103$$
$$x_{46} = -78.5143446648172$$
$$x_{47} = 87.9645943005142$$
$$x_{48} = 78.5143446648172$$
$$x_{49} = 59.656738426191$$
$$x_{50} = 69.1150383789755$$
$$x_{51} = -6.28318530717959$$
$$x_{52} = 40.7916847146183$$
$$x_{53} = 75.398223686155$$
$$x_{54} = -15.5797675022891$$
$$x_{55} = -12.5663706143592$$
$$x_{56} = -18.8495559215388$$
$$x_{57} = -37.6991118430775$$
$$x_{58} = 72.2289430706097$$
$$x_{59} = 15.5797675022891$$
$$x_{60} = 31.4159265358979$$
$$x_{61} = -81.6814089933346$$
$$x_{62} = 21.8998872970823$$
$$x_{63} = 28.2034502671317$$
$$x_{64} = -72.2289430706097$$
$$x_{65} = 9.20843355440115$$
$$x_{66} = 37.6991118430775$$
$$x_{67} = 25.1327412287183$$
$$x_{68} = -59.656738426191$$
$$x_{69} = 53.3696049818501$$
Signos de extremos en los puntos:
(43.982297150257104, 0)
(-43.982297150257104, 0)
(-2.331122370414423, -0.724611353776708)
(81.68140899333463, 0)
(-31.41592653589793, 0)
(-28.203450267131746, -0.0708242711210408)
(-84.79941767248933, -0.0235817882463307)
(-25.132741228718345, 0)
(34.49956366921579, 0.0579230818110724)
(65.94311888089696, 0.0303221960142206)
(-34.49956366921579, -0.0579230818110724)
(-94.2477796076938, 0)
(6.283185307179586, 0)
(84.79941767248933, 0.0235817882463307)
(97.36883252968656, 0.0205382874085413)
(-50.26548245743669, 0)
(-21.89988729708232, -0.0911346506917966)
(-75.39822368615503, 0)
(-9.208433554401154, -0.214660688386019)
(-1181.2388377497623, 0)
(-53.36960498185014, -0.0374613617155508)
(-56.548667764616276, 0)
(-40.791684714618334, -0.0490001524829528)
(50.26548245743669, 0)
(-307.87608005179976, 0)
(-69.11503837897546, 0)
(-100.53096491487338, 0)
(-97.36883252968656, -0.0205382874085413)
(91.0842301384618, 0.021955051448177)
(2.331122370414423, 0.724611353776708)
(56.548667764616276, 0)
(-62.83185307179586, 0)
(-87.96459430051421, 0)
(18.84955592153876, 0)
(-91.0842301384618, -0.021955051448177)
(100.53096491487338, 0)
(-65.94311888089696, -0.0303221960142206)
(62.83185307179586, 0)
(94.2477796076938, 0)
(12.566370614359172, 0)
(-103.65326306779691, -0.0192933035363155)
(92394.23994207582, 0)
(47.0814165846103, 0.0424604502887016)
(169.64600329384882, 0)
(-47.0814165846103, -0.0424604502887016)
(-78.51434466481717, -0.0254689206534694)
(87.96459430051421, 0)
(78.51434466481717, 0.0254689206534694)
(59.65673842619101, 0.0335157141235985)
(69.11503837897546, 0)
(-6.283185307179586, 0)
(40.791684714618334, 0.0490001524829528)
(75.39822368615503, 0)
(-15.579767502289146, -0.127844922574794)
(-12.566370614359172, 0)
(-18.84955592153876, 0)
(-37.69911184307752, 0)
(72.2289430706097, 0.0276844243853039)
(15.579767502289146, 0.127844922574794)
(31.41592653589793, 0)
(-81.68140899333463, 0)
(21.89988729708232, 0.0911346506917966)
(28.203450267131746, 0.0708242711210408)
(-72.2289430706097, -0.0276844243853039)
(9.208433554401154, 0.214660688386019)
(37.69911184307752, 0)
(25.132741228718345, 0)
(-59.65673842619101, -0.0335157141235985)
(53.36960498185014, 0.0374613617155508)
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:
$$x_{1} = 43.9822971502571$$
$$x_{2} = -2.33112237041442$$
$$x_{3} = 81.6814089933346$$
$$x_{4} = -28.2034502671317$$
$$x_{5} = -84.7994176724893$$
$$x_{6} = -34.4995636692158$$
$$x_{7} = 6.28318530717959$$
$$x_{8} = -21.8998872970823$$
$$x_{9} = -9.20843355440115$$
$$x_{10} = -53.3696049818501$$
$$x_{11} = -40.7916847146183$$
$$x_{12} = 50.2654824574367$$
$$x_{13} = -97.3688325296866$$
$$x_{14} = 56.5486677646163$$
$$x_{15} = 18.8495559215388$$
$$x_{16} = -91.0842301384618$$
$$x_{17} = 100.530964914873$$
$$x_{18} = -65.943118880897$$
$$x_{19} = 62.8318530717959$$
$$x_{20} = 94.2477796076938$$
$$x_{21} = 12.5663706143592$$
$$x_{22} = -103.653263067797$$
$$x_{23} = 92394.2399420758$$
$$x_{24} = 169.646003293849$$
$$x_{25} = -47.0814165846103$$
$$x_{26} = -78.5143446648172$$
$$x_{27} = 87.9645943005142$$
$$x_{28} = 69.1150383789755$$
$$x_{29} = 75.398223686155$$
$$x_{30} = -15.5797675022891$$
$$x_{31} = 31.4159265358979$$
$$x_{32} = -72.2289430706097$$
$$x_{33} = 37.6991118430775$$
$$x_{34} = 25.1327412287183$$
$$x_{35} = -59.656738426191$$
Puntos máximos de la función:
$$x_{35} = -43.9822971502571$$
$$x_{35} = -31.4159265358979$$
$$x_{35} = -25.1327412287183$$
$$x_{35} = 34.4995636692158$$
$$x_{35} = 65.943118880897$$
$$x_{35} = -94.2477796076938$$
$$x_{35} = 84.7994176724893$$
$$x_{35} = 97.3688325296866$$
$$x_{35} = -50.2654824574367$$
$$x_{35} = -75.398223686155$$
$$x_{35} = -1181.23883774976$$
$$x_{35} = -56.5486677646163$$
$$x_{35} = -307.8760800518$$
$$x_{35} = -69.1150383789755$$
$$x_{35} = -100.530964914873$$
$$x_{35} = 91.0842301384618$$
$$x_{35} = 2.33112237041442$$
$$x_{35} = -62.8318530717959$$
$$x_{35} = -87.9645943005142$$
$$x_{35} = 47.0814165846103$$
$$x_{35} = 78.5143446648172$$
$$x_{35} = 59.656738426191$$
$$x_{35} = -6.28318530717959$$
$$x_{35} = 40.7916847146183$$
$$x_{35} = -12.5663706143592$$
$$x_{35} = -18.8495559215388$$
$$x_{35} = -37.6991118430775$$
$$x_{35} = 72.2289430706097$$
$$x_{35} = 15.5797675022891$$
$$x_{35} = -81.6814089933346$$
$$x_{35} = 21.8998872970823$$
$$x_{35} = 28.2034502671317$$
$$x_{35} = 9.20843355440115$$
$$x_{35} = 53.3696049818501$$
Decrece en los intervalos
$$\left[92394.2399420758, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -103.653263067797\right]$$