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$$- \frac{\sqrt{2} \left(- x - 1\right) \sin{\left(\frac{\sqrt{2} x}{2} \right)}}{2} + \frac{\sqrt{2} \left(- x - 1\right) \cos{\left(\frac{\sqrt{2} x}{2} \right)}}{2} - \sin{\left(\frac{\sqrt{2} x}{2} \right)} - \cos{\left(\frac{\sqrt{2} x}{2} \right)} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -56.6826675610891$$
$$x_{2} = -25.6276971876651$$
$$x_{3} = -30.0582328781461$$
$$x_{4} = 63.3421606824646$$
$$x_{5} = 50.0216220875817$$
$$x_{6} = 1.77687936809853$$
$$x_{7} = -38.9279328760707$$
$$x_{8} = 54.4613693161347$$
$$x_{9} = 10.1745187671212$$
$$x_{10} = -3.96210099634574$$
$$x_{11} = 89.9903580789576$$
$$x_{12} = -8.05483051308111$$
$$x_{13} = 32.2709775887511$$
$$x_{14} = 98.8741692336653$$
$$x_{15} = 45.5824715372825$$
$$x_{16} = -78.8868476073282$$
$$x_{17} = 58.9015808298421$$
$$x_{18} = -70.0043858839905$$
$$x_{19} = -16.7871590134849$$
$$x_{20} = 5.84186222701659$$
$$x_{21} = 23.4069876500919$$
$$x_{22} = 27.8373174223413$$
$$x_{23} = 67.7830376469223$$
$$x_{24} = -12.3925873529074$$
$$x_{25} = -87.7699854329339$$
$$x_{26} = -92.211746210428$$
$$x_{27} = -52.242894420254$$
$$x_{28} = 41.144105598611$$
$$x_{29} = -1.05537450400253$$
$$x_{30} = -83.3283456710998$$
$$x_{31} = 36.7068002210725$$
$$x_{32} = 72.224157740075$$
$$x_{33} = 81.1069696811089$$
$$x_{34} = 14.5674907317375$$
$$x_{35} = -65.5634956420564$$
$$x_{36} = -43.3652995706866$$
$$x_{37} = 94.4322181849273$$
$$x_{38} = 85.5486029062939$$
$$x_{39} = -61.1228994620739$$
$$x_{40} = 18.9821750786416$$
$$x_{41} = -47.8037102427204$$
$$x_{42} = -34.4920230298981$$
$$x_{43} = 76.6654793043163$$
$$x_{44} = -101.095566418709$$
$$x_{45} = -74.4455169192843$$
$$x_{46} = -96.6536111584108$$
$$x_{47} = -21.2025302264653$$
Signos de extremos en los puntos:
/ ___\ / ___\
(-56.682667561089104, -1 + 55.6826675610891*cos\28.3413337805446*\/ 2 / - 55.6826675610891*sin\28.3413337805446*\/ 2 /)
/ ___\ / ___\
(-25.627697187665067, -1 + 24.6276971876651*cos\12.8138485938325*\/ 2 / - 24.6276971876651*sin\12.8138485938325*\/ 2 /)
/ ___\ / ___\
(-30.05823287814606, -1 + 29.0582328781461*cos\15.029116439073*\/ 2 / - 29.0582328781461*sin\15.029116439073*\/ 2 /)
/ ___\ / ___\
(63.3421606824646, -1 - 64.3421606824646*cos\31.6710803412323*\/ 2 / - 64.3421606824646*sin\31.6710803412323*\/ 2 /)
/ ___\ / ___\
(50.0216220875817, -1 - 51.0216220875817*cos\25.0108110437908*\/ 2 / - 51.0216220875817*sin\25.0108110437908*\/ 2 /)
/ ___\ / ___\
(1.7768793680985289, -1 - 2.77687936809853*cos\0.888439684049264*\/ 2 / - 2.77687936809853*sin\0.888439684049264*\/ 2 /)
/ ___\ / ___\
(-38.927932876070706, -1 + 37.9279328760707*cos\19.4639664380354*\/ 2 / - 37.9279328760707*sin\19.4639664380354*\/ 2 /)
/ ___\ / ___\
(54.46136931613474, -1 - 55.4613693161347*cos\27.2306846580674*\/ 2 / - 55.4613693161347*sin\27.2306846580674*\/ 2 /)
/ ___\ / ___\
(10.174518767121183, -1 - 11.1745187671212*cos\5.08725938356059*\/ 2 / - 11.1745187671212*sin\5.08725938356059*\/ 2 /)
/ ___\ / ___\
(-3.962100996345738, -1 + 2.96210099634574*cos\1.98105049817287*\/ 2 / - 2.96210099634574*sin\1.98105049817287*\/ 2 /)
/ ___\ / ___\
(89.99035807895756, -1 - 90.9903580789576*cos\44.9951790394788*\/ 2 / - 90.9903580789576*sin\44.9951790394788*\/ 2 /)
/ ___\ / ___\
(-8.054830513081113, -1 + 7.05483051308111*cos\4.02741525654056*\/ 2 / - 7.05483051308111*sin\4.02741525654056*\/ 2 /)
/ ___\ / ___\
(32.270977588751094, -1 - 33.2709775887511*cos\16.1354887943755*\/ 2 / - 33.2709775887511*sin\16.1354887943755*\/ 2 /)
/ ___\ / ___\
(98.87416923366531, -1 - 99.8741692336653*cos\49.4370846168327*\/ 2 / - 99.8741692336653*sin\49.4370846168327*\/ 2 /)
/ ___\ / ___\
(45.582471537282466, -1 - 46.5824715372825*cos\22.7912357686412*\/ 2 / - 46.5824715372825*sin\22.7912357686412*\/ 2 /)
/ ___\ / ___\
(-78.8868476073282, -1 + 77.8868476073282*cos\39.4434238036641*\/ 2 / - 77.8868476073282*sin\39.4434238036641*\/ 2 /)
/ ___\ / ___\
(58.901580829842096, -1 - 59.9015808298421*cos\29.450790414921*\/ 2 / - 59.9015808298421*sin\29.450790414921*\/ 2 /)
/ ___\ / ___\
(-70.00438588399047, -1 + 69.0043858839905*cos\35.0021929419952*\/ 2 / - 69.0043858839905*sin\35.0021929419952*\/ 2 /)
/ ___\ / ___\
(-16.787159013484853, -1 + 15.7871590134849*cos\8.39357950674243*\/ 2 / - 15.7871590134849*sin\8.39357950674243*\/ 2 /)
/ ___\ / ___\
(5.841862227016587, -1 - 6.84186222701659*cos\2.92093111350829*\/ 2 / - 6.84186222701659*sin\2.92093111350829*\/ 2 /)
/ ___\ / ___\
(23.40698765009192, -1 - 24.4069876500919*cos\11.703493825046*\/ 2 / - 24.4069876500919*sin\11.703493825046*\/ 2 /)
/ ___\ / ___\
(27.837317422341297, -1 - 28.8373174223413*cos\13.9186587111706*\/ 2 / - 28.8373174223413*sin\13.9186587111706*\/ 2 /)
/ ___\ / ___\
(67.78303764692231, -1 - 68.7830376469223*cos\33.8915188234612*\/ 2 / - 68.7830376469223*sin\33.8915188234612*\/ 2 /)
/ ___\ / ___\
(-12.392587352907352, -1 + 11.3925873529074*cos\6.19629367645368*\/ 2 / - 11.3925873529074*sin\6.19629367645368*\/ 2 /)
/ ___\ / ___\
(-87.76998543293394, -1 + 86.7699854329339*cos\43.884992716467*\/ 2 / - 86.7699854329339*sin\43.884992716467*\/ 2 /)
/ ___\ / ___\
(-92.21174621042796, -1 + 91.211746210428*cos\46.105873105214*\/ 2 / - 91.211746210428*sin\46.105873105214*\/ 2 /)
/ ___\ / ___\
(-52.242894420254046, -1 + 51.242894420254*cos\26.121447210127*\/ 2 / - 51.242894420254*sin\26.121447210127*\/ 2 /)
/ ___\ / ___\
(41.144105598610956, -1 - 42.144105598611*cos\20.5720527993055*\/ 2 / - 42.144105598611*sin\20.5720527993055*\/ 2 /)
/ ___\ / ___\
(-1.0553745040025266, -1 + 0.0553745040025266*cos\0.527687252001263*\/ 2 / - 0.0553745040025266*sin\0.527687252001263*\/ 2 /)
/ ___\ / ___\
(-83.32834567109983, -1 + 82.3283456710998*cos\41.6641728355499*\/ 2 / - 82.3283456710998*sin\41.6641728355499*\/ 2 /)
/ ___\ / ___\
(36.706800221072506, -1 - 37.7068002210725*cos\18.3534001105363*\/ 2 / - 37.7068002210725*sin\18.3534001105363*\/ 2 /)
/ ___\ / ___\
(72.22415774007503, -1 - 73.224157740075*cos\36.1120788700375*\/ 2 / - 73.224157740075*sin\36.1120788700375*\/ 2 /)
/ ___\ / ___\
(81.1069696811089, -1 - 82.1069696811089*cos\40.5534848405544*\/ 2 / - 82.1069696811089*sin\40.5534848405544*\/ 2 /)
/ ___\ / ___\
(14.567490731737491, -1 - 15.5674907317375*cos\7.28374536586875*\/ 2 / - 15.5674907317375*sin\7.28374536586875*\/ 2 /)
/ ___\ / ___\
(-65.56349564205641, -1 + 64.5634956420564*cos\32.7817478210282*\/ 2 / - 64.5634956420564*sin\32.7817478210282*\/ 2 /)
/ ___\ / ___\
(-43.36529957068655, -1 + 42.3652995706866*cos\21.6826497853433*\/ 2 / - 42.3652995706866*sin\21.6826497853433*\/ 2 /)
/ ___\ / ___\
(94.43221818492732, -1 - 95.4322181849273*cos\47.2161090924637*\/ 2 / - 95.4322181849273*sin\47.2161090924637*\/ 2 /)
/ ___\ / ___\
(85.54860290629391, -1 - 86.5486029062939*cos\42.774301453147*\/ 2 / - 86.5486029062939*sin\42.774301453147*\/ 2 /)
/ ___\ / ___\
(-61.12289946207391, -1 + 60.1228994620739*cos\30.561449731037*\/ 2 / - 60.1228994620739*sin\30.561449731037*\/ 2 /)
/ ___\ / ___\
(18.98217507864162, -1 - 19.9821750786416*cos\9.49108753932081*\/ 2 / - 19.9821750786416*sin\9.49108753932081*\/ 2 /)
/ ___\ / ___\
(-47.80371024272038, -1 + 46.8037102427204*cos\23.9018551213602*\/ 2 / - 46.8037102427204*sin\23.9018551213602*\/ 2 /)
/ ___\ / ___\
(-34.492023029898064, -1 + 33.4920230298981*cos\17.246011514949*\/ 2 / - 33.4920230298981*sin\17.246011514949*\/ 2 /)
/ ___\ / ___\
(76.66547930431632, -1 - 77.6654793043163*cos\38.3327396521582*\/ 2 / - 77.6654793043163*sin\38.3327396521582*\/ 2 /)
/ ___\ / ___\
(-101.09556641870877, -1 + 100.095566418709*cos\50.5477832093544*\/ 2 / - 100.095566418709*sin\50.5477832093544*\/ 2 /)
/ ___\ / ___\
(-74.44551691928426, -1 + 73.4455169192843*cos\37.2227584596421*\/ 2 / - 73.4455169192843*sin\37.2227584596421*\/ 2 /)
/ ___\ / ___\
(-96.65361115841083, -1 + 95.6536111584108*cos\48.3268055792054*\/ 2 / - 95.6536111584108*sin\48.3268055792054*\/ 2 /)
/ ___\ / ___\
(-21.202530226465328, -1 + 20.2025302264653*cos\10.6012651132327*\/ 2 / - 20.2025302264653*sin\10.6012651132327*\/ 2 /)
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:
$$x_{1} = -56.6826675610891$$
$$x_{2} = -30.0582328781461$$
$$x_{3} = 63.3421606824646$$
$$x_{4} = 1.77687936809853$$
$$x_{5} = -38.9279328760707$$
$$x_{6} = 54.4613693161347$$
$$x_{7} = 10.1745187671212$$
$$x_{8} = -3.96210099634574$$
$$x_{9} = 89.9903580789576$$
$$x_{10} = 98.8741692336653$$
$$x_{11} = 45.5824715372825$$
$$x_{12} = 27.8373174223413$$
$$x_{13} = -12.3925873529074$$
$$x_{14} = -92.211746210428$$
$$x_{15} = -83.3283456710998$$
$$x_{16} = 36.7068002210725$$
$$x_{17} = 72.224157740075$$
$$x_{18} = 81.1069696811089$$
$$x_{19} = -65.5634956420564$$
$$x_{20} = 18.9821750786416$$
$$x_{21} = -47.8037102427204$$
$$x_{22} = -101.095566418709$$
$$x_{23} = -74.4455169192843$$
$$x_{24} = -21.2025302264653$$
Puntos máximos de la función:
$$x_{24} = -25.6276971876651$$
$$x_{24} = 50.0216220875817$$
$$x_{24} = -8.05483051308111$$
$$x_{24} = 32.2709775887511$$
$$x_{24} = -78.8868476073282$$
$$x_{24} = 58.9015808298421$$
$$x_{24} = -70.0043858839905$$
$$x_{24} = -16.7871590134849$$
$$x_{24} = 5.84186222701659$$
$$x_{24} = 23.4069876500919$$
$$x_{24} = 67.7830376469223$$
$$x_{24} = -87.7699854329339$$
$$x_{24} = -52.242894420254$$
$$x_{24} = 41.144105598611$$
$$x_{24} = -1.05537450400253$$
$$x_{24} = 14.5674907317375$$
$$x_{24} = -43.3652995706866$$
$$x_{24} = 94.4322181849273$$
$$x_{24} = 85.5486029062939$$
$$x_{24} = -61.1228994620739$$
$$x_{24} = -34.4920230298981$$
$$x_{24} = 76.6654793043163$$
$$x_{24} = -96.6536111584108$$
Decrece en los intervalos
$$\left[98.8741692336653, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -101.095566418709\right]$$