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$$\frac{\left(2 x - 1\right) e^{x}}{4} + \left(- \frac{\sqrt{7} \sin{\left(\frac{\sqrt{7} x}{2} \right)}}{2} + \frac{\sqrt{7} \cos{\left(\frac{\sqrt{7} x}{2} \right)}}{2}\right) e^{\frac{x}{2}} + \frac{\left(\sin{\left(\frac{\sqrt{7} x}{2} \right)} + \cos{\left(\frac{\sqrt{7} x}{2} \right)}\right) e^{\frac{x}{2}}}{2} + \frac{e^{x}}{2} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -94.1259598629357$$
$$x_{2} = -15.755779912503$$
$$x_{3} = -41.8799017533883$$
$$x_{4} = -1.42217576938552$$
$$x_{5} = -68.0029308050137$$
$$x_{6} = -6.20917368947973$$
$$x_{7} = -82.2518557456984$$
$$x_{8} = -77.5022140988035$$
$$x_{9} = -87.0014973925933$$
$$x_{10} = -51.3791850409486$$
$$x_{11} = -89.3763182160408$$
$$x_{12} = -79.877034922251$$
$$x_{13} = -98.8756015098306$$
$$x_{14} = -58.5036475112218$$
$$x_{15} = -49.0043642172247$$
$$x_{16} = -65.6281099815663$$
$$x_{17} = -75.1273932753561$$
$$x_{18} = -56.1288266877833$$
$$x_{19} = -44.2547225685085$$
$$x_{20} = -3.97301510526696$$
$$x_{21} = -30.0057959290573$$
$$x_{22} = -13.3850716616592$$
$$x_{23} = -27.6309819337811$$
$$x_{24} = -106.000063980173$$
$$x_{25} = -72.7525724519086$$
$$x_{26} = -91.7511390394882$$
$$x_{27} = -96.5007806863832$$
$$x_{28} = -46.6295433946397$$
$$x_{29} = -63.2532891581186$$
$$x_{30} = -84.6266765691459$$
$$x_{31} = -25.2561406437611$$
$$x_{32} = -34.7554390930521$$
$$x_{33} = -32.3806190138149$$
$$x_{34} = -10.9991185571585$$
$$x_{35} = -22.8813806247205$$
$$x_{36} = -60.8784683346721$$
$$x_{37} = -20.5063810804705$$
$$x_{38} = -70.3777516284612$$
$$x_{39} = -37.1302601601107$$
$$x_{40} = -8.65277374376613$$
$$x_{41} = -18.1320784532039$$
$$x_{42} = -53.7540058643076$$
$$x_{43} = -39.5050809041852$$
Signos de extremos en los puntos:
/ ___\ / ___\
(-94.1259598629357, -6.26030265779763e-40 + 3.6375377898546e-21*cos\47.0629799314679*\/ 7 / - 3.6375377898546e-21*sin\47.0629799314679*\/ 7 /)
/ ___\ / ___\
(-15.75577991250299, -1.16769532367355e-6 + 0.000379031987672711*cos\7.87788995625149*\/ 7 / - 0.000379031987672711*sin\7.87788995625149*\/ 7 /)
/ ___\ / ___\
(-41.87990175338834, -1.37378799133662e-17 + 8.05183530179873e-10*cos\20.9399508766942*\/ 7 / - 8.05183530179873e-10*sin\20.9399508766942*\/ 7 /)
/ ___\ / ___\
(-1.4221757693855204, -0.231803513138953 + 0.491109636087551*cos\0.71108788469276*\/ 7 / - 0.491109636087551*sin\0.71108788469276*\/ 7 /)
/ ___\ / ___\
(-68.0029308050137, -1.00318621330841e-28 + 1.7113987051587e-15*cos\34.0014654025069*\/ 7 / - 1.7113987051587e-15*sin\34.0014654025069*\/ 7 /)
/ ___\ / ___\
(-6.209173689479733, -0.00674573333302558 + 0.044843041871131*cos\3.10458684473987*\/ 7 / - 0.044843041871131*sin\3.10458684473987*\/ 7 /)
/ ___\ / ___\
(-82.25185574569844, -7.85634722257839e-35 + 1.37795952660143e-18*cos\41.1259278728492*\/ 7 / - 1.37795952660143e-18*sin\41.1259278728492*\/ 7 /)
/ ___\ / ___\
(-77.50221409880353, -8.55643816730485e-33 + 1.48118068741037e-17*cos\38.7511070494018*\/ 7 / - 1.48118068741037e-17*sin\38.7511070494018*\/ 7 /)
/ ___\ / ___\
(-87.00149739259334, -7.18977425313771e-37 + 1.28193168672174e-19*cos\43.5007486962967*\/ 7 / - 1.28193168672174e-19*sin\43.5007486962967*\/ 7 /)
/ ___\ / ___\
(-51.37918504094856, -1.25969846918233e-21 + 6.96869931502913e-12*cos\25.6895925204743*\/ 7 / - 6.96869931502913e-12*sin\25.6895925204743*\/ 7 /)
/ ___\ / ___\
(-89.37631821604079, -6.8702645968828e-38 + 3.91002102750183e-20*cos\44.6881591080204*\/ 7 / - 3.91002102750183e-20*sin\44.6881591080204*\/ 7 /)
/ ___\ / ___\
(-79.87703492225099, -8.20250470185076e-34 + 4.51775058943627e-18*cos\39.9385174611255*\/ 7 / - 4.51775058943627e-18*sin\39.9385174611255*\/ 7 /)
/ ___\ / ___\
(-98.8756015098306, -5.69012286610207e-42 + 3.38404348200507e-22*cos\49.4378007549153*\/ 7 / - 3.38404348200507e-22*sin\49.4378007549153*\/ 7 /)
/ ___\ / ___\
(-58.50364751122175, -1.15355306875257e-24 + 1.97739921463783e-13*cos\29.2518237556109*\/ 7 / - 1.97739921463783e-13*sin\29.2518237556109*\/ 7 /)
/ ___\ / ___\
(-49.004364217224676, -1.29207737816685e-20 + 2.28474384295431e-11*cos\24.5021821086123*\/ 7 / - 2.28474384295431e-11*sin\24.5021821086123*\/ 7 /)
/ ___\ / ___\
(-65.62810998156634, -1.04095053286571e-27 + 5.61095762228959e-15*cos\32.8140549907832*\/ 7 / - 5.61095762228959e-15*sin\32.8140549907832*\/ 7 /)
/ ___\ / ___\
(-75.12739327535608, -8.91737019878726e-32 + 4.85616942619051e-17*cos\37.563696637678*\/ 7 / - 4.85616942619051e-17*sin\37.563696637678*\/ 7 /)
/ ___\ / ___\
(-56.12882668778328, -1.19005726940378e-23 + 6.48306158125984e-13*cos\28.0644133438916*\/ 7 / - 6.48306158125984e-13*sin\28.0644133438916*\/ 7 /)
/ ___\ / ___\
(-44.25472256850846, -1.34966835085251e-18 + 2.4558910429626e-10*cos\22.1273612842542*\/ 7 / - 2.4558910429626e-10*sin\22.1273612842542*\/ 7 /)
/ ___\ / ___\
(-3.97301510526696, -0.0420834980941479 + 0.13717366164542*cos\1.98650755263348*\/ 7 / - 0.13717366164542*sin\1.98650755263348*\/ 7 /)
/ ___\ / ___\
(-30.005795929057342, -1.41906003086446e-12 + 3.05017109702037e-7*cos\15.0028979645287*\/ 7 / - 3.05017109702037e-7*sin\15.0028979645287*\/ 7 /)
/ ___\ / ___\
(-13.385071661659248, -1.06771505721615e-5 + 0.00124013401222523*cos\6.69253583082962*\/ 7 / - 0.00124013401222523*sin\6.69253583082962*\/ 7 /)
/ ___\ / ___\
(-27.630981933781136, -1.40660420938282e-11 + 1.00001959126561e-6*cos\13.8154909668906*\/ 7 / - 1.00001959126561e-6*sin\13.8154909668906*\/ 7 /)
/ ___\ / ___\
(-106.00006398017295, -4.90994927060766e-45 + 9.6023728688568e-24*cos\53.0000319900865*\/ 7 / - 9.6023728688568e-24*sin\53.0000319900865*\/ 7 /)
/ ___\ / ___\
(-72.75257245190862, -9.28436327157574e-31 + 1.59213401148904e-16*cos\36.3762862259543*\/ 7 / - 1.59213401148904e-16*sin\36.3762862259543*\/ 7 /)
/ ___\ / ___\
(-91.75113903948824, -6.56037021695846e-39 + 1.19259587650906e-20*cos\45.8755695197441*\/ 7 / - 1.19259587650906e-20*sin\45.8755695197441*\/ 7 /)
/ ___\ / ___\
(-96.50078068638315, -5.97019728305877e-41 + 1.1094857389036e-21*cos\48.2503903431916*\/ 7 / - 1.1094857389036e-21*sin\48.2503903431916*\/ 7 /)
/ ___\ / ___\
(-46.629543394639676, -1.3222386464189e-19 + 7.49071553953719e-11*cos\23.3147716973198*\/ 7 / - 7.49071553953719e-11*sin\23.3147716973198*\/ 7 /)
/ ___\ / ___\
(-63.253289158118605, -1.07874341219728e-26 + 1.83959736233504e-14*cos\31.6266445790593*\/ 7 / - 1.83959736233504e-14*sin\31.6266445790593*\/ 7 /)
/ ___\ / ___\
(-84.62667656914589, -7.51860080687726e-36 + 4.20291563104765e-19*cos\42.3133382845729*\/ 7 / - 4.20291563104765e-19*sin\42.3133382845729*\/ 7 /)
/ ___\ / ___\
(-25.256140643761082, -1.38435755926957e-10 + 3.27867781545686e-6*cos\12.6280703218805*\/ 7 / - 3.27867781545686e-6*sin\12.6280703218805*\/ 7 /)
/ ___\ / ___\
(-34.75543909305208, -1.41938665637297e-14 + 2.83760730100961e-8*cos\17.377719546526*\/ 7 / - 2.83760730100961e-8*sin\17.377719546526*\/ 7 /)
/ ___\ / ___\
(-32.38061901381489, -1.42293752015255e-13 + 9.30331917520394e-8*cos\16.1903095069074*\/ 7 / - 9.30331917520394e-8*sin\16.1903095069074*\/ 7 /)
/ ___\ / ___\
(-10.999118557158472, -9.61120987422611e-5 + 0.00408857296313486*cos\5.49955927857924*\/ 7 / - 0.00408857296313486*sin\5.49955927857924*\/ 7 /)
/ ___\ / ___\
(-22.881380624720506, -1.35077437281816e-9 + 1.0749080817876e-5*cos\11.4406903123603*\/ 7 / - 1.0749080817876e-5*sin\11.4406903123603*\/ 7 /)
/ ___\ / ___\
(-60.87846833467206, -1.11635722260626e-25 + 6.03126717989204e-14*cos\30.439234167336*\/ 7 / - 6.03126717989204e-14*sin\30.439234167336*\/ 7 /)
/ ___\ / ___\
(-20.50638108047054, -1.30470731439589e-8 + 3.52448710917598e-5*cos\10.2531905402353*\/ 7 / - 3.52448710917598e-5*sin\10.2531905402353*\/ 7 /)
/ ___\ / ___\
(-70.37775162846118, -9.65630013227576e-30 + 5.21993877904848e-16*cos\35.1888758142306*\/ 7 / - 5.21993877904848e-16*sin\35.1888758142306*\/ 7 /)
/ ___\ / ___\
(-37.13026016011073, -1.40941901370428e-15 + 8.65498760832404e-9*cos\18.5651300800554*\/ 7 / - 8.65498760832404e-9*sin\18.5651300800554*\/ 7 /)
/ ___\ / ___\
(-8.652773743766135, -0.000799228277034128 + 0.0132152095789127*cos\4.32638687188307*\/ 7 / - 0.0132152095789127*sin\4.32638687188307*\/ 7 /)
/ ___\ / ___\
(-18.132078453203864, -1.24328212826405e-7 + 0.000115523194890462*cos\9.06603922660193*\/ 7 / - 0.000115523194890462*sin\9.06603922660193*\/ 7 /)
/ ___\ / ___\
(-53.75400586430762, -1.22555748652212e-22 + 2.12552362497459e-12*cos\26.8770029321538*\/ 7 / - 2.12552362497459e-12*sin\26.8770029321538*\/ 7 /)
/ ___\ / ___\
(-39.5050809041852, -1.39394780888258e-16 + 2.63985867849902e-9*cos\19.7525404520926*\/ 7 / - 2.63985867849902e-9*sin\19.7525404520926*\/ 7 /)
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:
$$x_{1} = -15.755779912503$$
$$x_{2} = -1.42217576938552$$
$$x_{3} = -68.0029308050137$$
$$x_{4} = -6.20917368947973$$
$$x_{5} = -82.2518557456984$$
$$x_{6} = -77.5022140988035$$
$$x_{7} = -87.0014973925933$$
$$x_{8} = -58.5036475112218$$
$$x_{9} = -49.0043642172247$$
$$x_{10} = -44.2547225685085$$
$$x_{11} = -30.0057959290573$$
$$x_{12} = -106.000063980173$$
$$x_{13} = -72.7525724519086$$
$$x_{14} = -91.7511390394882$$
$$x_{15} = -96.5007806863832$$
$$x_{16} = -63.2532891581186$$
$$x_{17} = -25.2561406437611$$
$$x_{18} = -34.7554390930521$$
$$x_{19} = -10.9991185571585$$
$$x_{20} = -20.5063810804705$$
$$x_{21} = -53.7540058643076$$
$$x_{22} = -39.5050809041852$$
Puntos máximos de la función:
$$x_{22} = -94.1259598629357$$
$$x_{22} = -41.8799017533883$$
$$x_{22} = -51.3791850409486$$
$$x_{22} = -89.3763182160408$$
$$x_{22} = -79.877034922251$$
$$x_{22} = -98.8756015098306$$
$$x_{22} = -65.6281099815663$$
$$x_{22} = -75.1273932753561$$
$$x_{22} = -56.1288266877833$$
$$x_{22} = -3.97301510526696$$
$$x_{22} = -13.3850716616592$$
$$x_{22} = -27.6309819337811$$
$$x_{22} = -46.6295433946397$$
$$x_{22} = -84.6266765691459$$
$$x_{22} = -32.3806190138149$$
$$x_{22} = -22.8813806247205$$
$$x_{22} = -60.8784683346721$$
$$x_{22} = -70.3777516284612$$
$$x_{22} = -37.1302601601107$$
$$x_{22} = -8.65277374376613$$
$$x_{22} = -18.1320784532039$$
Decrece en los intervalos
$$\left[-1.42217576938552, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -106.000063980173\right]$$