Para hallar los extremos hay que resolver la ecuación
dtdf(t)=0(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
dtdf(t)=primera derivada50239t2sin(t2)−50239tsin2(t)−50457tsin(t2)+(50239tcos(t)+50239sin(t))cos(t)−103sin2(t)+103cos2(t)−100239cos(t2)+5071+50479e−2t+500668177e−5t−1000946131e−103t=0Resolvermos esta ecuaciónRaíces de esta ecuación
t1=25.5620939701186t2=60.0284976028315t3=46.1858721311232t4=11.3550769228536t5=80.5832776004928t6=28.2475762469396t7=16.2425019772975t8=64.2500433893311t9=83.399627922718t10=12.1607346004456t11=9.89223778713139t12=42.2427277419535t13=15.3535638720642t14=16.1506470944167t15=32.0022742879839t16=74.1047625388337t17=22.1367155965153t18=12.0128475826591t19=56.3574966932718t20=70.1408641990001t21=31.5581819037535t22=18.2473953741883t23=66.2007249189901t24=58.2755948247452t25=19.9740733044362t26=13.3856413987408t27=52.2496958105707t28=78.2292266849166t29=48.3462657435853t30=82.204453822137t31=30.1842561918235t32=20.4399367237379t33=31.8051618149549t34=94.1405521380375t35=33.9089191283485t36=30.2880727021071t37=19.8165650233114t38=14.2900354282217t39=24.0432127233219t40=8.27580500489127Signos de extremos en los puntos:
(25.562093970118603, -414.87829086283)
(60.02849760283145, -88.2835437217465)
(46.185872131123155, -336.956413026074)
(11.355076922853568, -966.798553103985)
(80.58327760049276, -256.089191382472)
(28.247576246939648, -451.53778599988)
(16.24250197729749, -614.537902927669)
(64.25004338933105, -413.844144156691)
(83.39962792271795, -536.560274584493)
(12.160734600445558, -887.204198378458)
(9.89223778713139, -1113.86466225692)
(42.24272774195354, -406.595524955307)
(15.353563872064166, -650.984264595503)
(16.15064709441668, -554.931295198481)
(32.002274287983944, -368.986689780612)
(74.1047625388337, -562.938407829749)
(22.13671559651531, -479.585882644763)
(12.012847582659134, -953.430384547783)
(56.357496693271784, -242.541953666734)
(70.14086419900013, -316.988743375628)
(31.558181903753546, -277.325435122802)
(18.247395374188265, -616.763794244041)
(66.20072491899013, -85.1179615968724)
(58.27559482474522, -227.73075755387)
(19.974073304436192, -408.605548347614)
(13.385641398740821, -726.509445629229)
(52.24969581057071, -299.975832678507)
(78.22922668491661, -582.484783813349)
(48.34626574358535, -370.757005197777)
(82.20445382213697, 76.5122382448092)
(30.184256191823458, -487.915560544215)
(20.439936723737866, -436.151749895781)
(31.80516181495487, -386.374452123016)
(94.14055213803755, -96.1015174199105)
(33.90891912834853, -516.22986069639)
(30.288072702107087, -498.530038443833)
(19.816565023311412, -405.631648770265)
(14.29003542822171, -702.798589597198)
(24.043212723321915, -520.489678718798)
(8.275805004891268, -1430.98505800608)
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:
t1=25.5620939701186t2=28.2475762469396t3=16.2425019772975t4=64.2500433893311t5=83.399627922718t6=42.2427277419535t7=32.0022742879839t8=74.1047625388337t9=22.1367155965153t10=12.0128475826591t11=70.1408641990001t12=18.2473953741883t13=78.2292266849166t14=48.3462657435853t15=30.1842561918235t16=31.8051618149549t17=33.9089191283485t18=30.2880727021071t19=24.0432127233219t20=8.27580500489127Puntos máximos de la función:
t20=60.0284976028315t20=46.1858721311232t20=11.3550769228536t20=80.5832776004928t20=12.1607346004456t20=9.89223778713139t20=15.3535638720642t20=16.1506470944167t20=56.3574966932718t20=31.5581819037535t20=66.2007249189901t20=58.2755948247452t20=19.9740733044362t20=13.3856413987408t20=52.2496958105707t20=82.204453822137t20=20.4399367237379t20=94.1405521380375t20=19.8165650233114t20=14.2900354282217Decrece en los intervalos
[83.399627922718,∞)Crece en los intervalos
(−∞,8.27580500489127]