Para hallar los extremos hay que resolver la ecuación
dxdf(x)=0(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
dxdf(x)=primera derivada−254xsin(x)+253xcos(x)−1257sin(x)+12524cos(x)=0Resolvermos esta ecuaciónRaíces de esta ecuación
x1=60.3435741810726x2=−55.916052346554x3=−71.6216017124802x4=−77.9040967615667x5=−43.3528952053232x6=−68.4804022334892x7=0.9702797191989x8=7.00342474595104x9=57.2025128838723x10=−59.0570581265178x11=−2.79081735122193x12=−24.5145356614537x13=−27.6531727847406x14=41.4983895913798x15=54.061512412669x16=−15.1063769354718x17=44.6390020070488x18=88.6148056066909x19=−33.9321254135618x20=94.8975503872968x21=−52.7751174749286x22=82.3321274030778x23=−30.7924278084605x24=38.3579343180476x25=−37.072150842054x26=47.7797411121363x27=−84.1866958063905x28=19.5225722782886x29=3.91175320615241x30=79.1908181687649x31=10.1231531192315x32=−65.3392410183755x33=66.6258452641675x34=35.2176772443726x35=−8.85562172330338x36=76.0495321008973x37=72.9082721605229x38=−18.2404440436623x39=−93.610743177676x40=−11.9765020817174x41=25.7987959247262x42=−87.3280272500001x43=−81.0453848107283x44=91.7561705220584x45=−90.4693769930113x46=−0.847798665221398x47=−5.76006544608496x48=50.9205838429843x49=85.4734572738959x50=98.0389437772169x51=63.4846873920035x52=69.7670418356969x53=−62.1981239375045x54=22.6602193184132x55=101.180349442191x56=−49.6342671849204x57=−21.3767982617586x58=16.3863616069185x59=−74.7628345817544x60=−99.8935186185057x61=−96.7521241894601x62=−46.4935189054968x63=28.9380084537933x64=−40.2124258371891x65=32.0776750847295x66=13.2525427048988Signos de extremos en los puntos:
(60.3435741810726, -12.2273411008631)
(-55.91605234655403, -11.0216865220558)
(-71.62160171248024, 14.1631343153847)
(-77.90409676156675, 15.4197299560894)
(-43.35289520532315, -8.50860526556136)
(-68.48040223348916, -13.5348393785407)
(0.9702797191989003, 0.309640261715011)
(7.00342474595104, 1.54995890251157)
(57.202512883872316, 11.5990544577366)
(-59.05705812651784, 11.6499698327822)
(-2.7908173512219285, 0.358140889352609)
(-24.51453566145369, -4.73936637691713)
(-27.65317278474062, 5.36750738276238)
(41.4983895913798, -8.45769226963505)
(54.06151241266902, -10.9707714656737)
(-15.106376935471832, 2.85541014104577)
(44.639002007048845, 9.08595196493008)
(88.61480560669094, 17.8820217052865)
(-33.932125413561785, 6.62389028369178)
(94.8975503872968, 19.1386323329934)
(-52.77511747492858, 10.393407467772)
(82.33212740307785, 16.6254150728938)
(-30.79242780846053, -5.99568553507477)
(38.357934318047576, 7.82944201021356)
(-37.07215084205401, -7.25211472677849)
(47.77974111213629, -9.71421926670766)
(-84.18669580639047, 16.6763318380014)
(19.522572278288568, 4.06038330655216)
(3.911753206152409, -0.924696172484364)
(79.19081816876492, -15.9971135490977)
(10.12315311923153, -2.17695459030595)
(-65.33924101837547, 12.9065467382233)
(66.62584526416754, -13.4839232996446)
(35.217677244372574, -7.201203653579)
(-8.855621723303384, 1.60073181180591)
(76.04953210089727, 15.3688134155889)
(72.9082721605229, -14.7405148500969)
(-18.2404440436623, -3.48327587534032)
(-93.61074317767604, -18.5612435908632)
(-11.976502081717385, -2.22779776890921)
(25.798795924726196, 5.31660212249623)
(-87.32802725000013, -17.3046346946212)
(-81.0453848107283, -16.0480302085025)
(91.75617052205843, -18.5103265705714)
(-90.46937699301132, 17.9329386494078)
(-0.8477986652213977, 0.0789881794087364)
(-5.760065446084964, -0.975226558431923)
(50.920583842984314, 10.3424927896896)
(85.47345727389586, -17.2537178351279)
(98.03894377721686, -19.7669389070187)
(63.48468739200345, 12.8556308599678)
(69.76704183569687, 14.1122180619904)
(-62.19812393750447, -12.2782567468409)
(22.66021931841318, -4.68846475568188)
(101.18034944219134, 20.3952462176515)
(-49.63426718492042, -9.76513349099207)
(-21.376798261758633, 4.11127949053971)
(16.38636160691848, -3.43238833820508)
(-74.76283458175439, -14.7914312561985)
(-99.89351861850574, -19.8178560584706)
(-96.75212418946008, 19.1895494220886)
(-46.49351890549679, 9.13686563841126)
(28.938008453793262, -5.94477772069325)
(-40.212425837189116, 7.88035415974942)
(32.07767508472954, 6.57298060824512)
(13.252542704898833, 2.80453758171173)
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:
x1=60.3435741810726x2=−55.916052346554x3=−43.3528952053232x4=−68.4804022334892x5=−24.5145356614537x6=41.4983895913798x7=54.061512412669x8=−30.7924278084605x9=−37.072150842054x10=47.7797411121363x11=3.91175320615241x12=79.1908181687649x13=10.1231531192315x14=66.6258452641675x15=35.2176772443726x16=72.9082721605229x17=−18.2404440436623x18=−93.610743177676x19=−11.9765020817174x20=−87.3280272500001x21=−81.0453848107283x22=91.7561705220584x23=−0.847798665221398x24=−5.76006544608496x25=85.4734572738959x26=98.0389437772169x27=−62.1981239375045x28=22.6602193184132x29=−49.6342671849204x30=16.3863616069185x31=−74.7628345817544x32=−99.8935186185057x33=28.9380084537933Puntos máximos de la función:
x33=−71.6216017124802x33=−77.9040967615667x33=0.9702797191989x33=7.00342474595104x33=57.2025128838723x33=−59.0570581265178x33=−2.79081735122193x33=−27.6531727847406x33=−15.1063769354718x33=44.6390020070488x33=88.6148056066909x33=−33.9321254135618x33=94.8975503872968x33=−52.7751174749286x33=82.3321274030778x33=38.3579343180476x33=−84.1866958063905x33=19.5225722782886x33=−65.3392410183755x33=−8.85562172330338x33=76.0495321008973x33=25.7987959247262x33=−90.4693769930113x33=50.9205838429843x33=63.4846873920035x33=69.7670418356969x33=101.180349442191x33=−21.3767982617586x33=−96.7521241894601x33=−46.4935189054968x33=−40.2124258371891x33=32.0776750847295x33=13.2525427048988Decrece en los intervalos
[98.0389437772169,∞)Crece en los intervalos
(−∞,−99.8935186185057]