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-x^2*sin(3*x)/3-x*cos(3*x)/9

Gráfico de la función y = -x^2*sin(3*x)/3-x*cos(3*x)/9

v

Gráfico:

interior superior

Puntos de intersección:

mostrar?

Definida a trozos:

Solución

Ha introducido [src]
         2                      
       -x *sin(3*x)   x*cos(3*x)
f(x) = ------------ - ----------
            3             9     
$$f{\left(x \right)} = - \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3}$$
f = -x*cos(3*x)/9 + ((-x^2)*sin(3*x))/3
Gráfico de la función
Puntos de cruce con el eje de coordenadas X
El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3} = 0$$
Resolvermos esta ecuación
Puntos de cruce con el eje X:

Solución numérica
$$x_{1} = 100.529859664112$$
$$x_{2} = -11.5095219184874$$
$$x_{3} = 104.718694079539$$
$$x_{4} = 9.41297885842009$$
$$x_{5} = -70.1606522750674$$
$$x_{6} = -26.175694189314$$
$$x_{7} = 68.0662084432899$$
$$x_{8} = -2.04041682229936$$
$$x_{9} = -72.2550932818291$$
$$x_{10} = -85.8689052424954$$
$$x_{11} = 26.175694189314$$
$$x_{12} = 70.1606522750674$$
$$x_{13} = 4.16215146507459$$
$$x_{14} = -48.1687806880291$$
$$x_{15} = 8.36430347070403$$
$$x_{16} = -59.6883989181816$$
$$x_{17} = 54.4522321632607$$
$$x_{18} = 63.8773111931308$$
$$x_{19} = 59.6883989181816$$
$$x_{20} = 83.774477790537$$
$$x_{21} = 30.365069956469$$
$$x_{22} = -43.9797707845755$$
$$x_{23} = -63.8773111931308$$
$$x_{24} = 65.9717615174301$$
$$x_{25} = -24.0809299015658$$
$$x_{26} = -92.1521787755176$$
$$x_{27} = -90.0577556323905$$
$$x_{28} = -57.5939361219082$$
$$x_{29} = -55.4994682163072$$
$$x_{30} = -17.7961155405752$$
$$x_{31} = 46.0742807299773$$
$$x_{32} = 76.4439677491279$$
$$x_{33} = 2.04041682229936$$
$$x_{34} = 39.7907146228615$$
$$x_{35} = 50.2632719073064$$
$$x_{36} = 0$$
$$x_{37} = -94.246600672358$$
$$x_{38} = 61.7828571247626$$
$$x_{39} = 15.7008875901208$$
$$x_{40} = 19.8911680434802$$
$$x_{41} = -21.9860952631301$$
$$x_{42} = 48.1687806880291$$
$$x_{43} = 6.26546812207005$$
$$x_{44} = -65.9717615174301$$
$$x_{45} = -19.8911680434802$$
$$x_{46} = 52.3577554365829$$
$$x_{47} = -83.774477790537$$
$$x_{48} = -37.6961643756871$$
$$x_{49} = 10.4613580059633$$
$$x_{50} = 85.8689052424954$$
$$x_{51} = -30.365069956469$$
$$x_{52} = -95.2938111791005$$
$$x_{53} = -4.16215146507459$$
$$x_{54} = -5.21470945677768$$
$$x_{55} = 43.9797707845755$$
$$x_{56} = -77.4911849425451$$
$$x_{57} = 21.9860952631301$$
$$x_{58} = -33.5070056915622$$
$$x_{59} = -79.5856177786224$$
$$x_{60} = 13.6054031088782$$
$$x_{61} = -28.2704037664393$$
$$x_{62} = 87.963331153953$$
$$x_{63} = 37.6961643756871$$
$$x_{64} = -99.4826504785238$$
$$x_{65} = -38.743441596136$$
$$x_{66} = 28.2704037664393$$
$$x_{67} = -53.4049946002223$$
$$x_{68} = -46.0742807299773$$
$$x_{69} = -60.7356285655065$$
$$x_{70} = -39.7907146228615$$
$$x_{71} = -3.10595548726369$$
$$x_{72} = -35.6015958731568$$
$$x_{73} = 98.4354410453895$$
$$x_{74} = 72.2550932818291$$
$$x_{75} = 78.5384016121507$$
$$x_{76} = -50.2632719073064$$
$$x_{77} = -41.8852493534853$$
$$x_{78} = -6.26546812207005$$
$$x_{79} = -74.3495317023222$$
$$x_{80} = 79.5856177786224$$
$$x_{81} = -13.6054031088782$$
$$x_{82} = 94.246600672358$$
$$x_{83} = 41.8852493534853$$
$$x_{84} = -68.0662084432899$$
$$x_{85} = -87.963331153953$$
$$x_{86} = 17.7961155405752$$
$$x_{87} = -15.7008875901208$$
$$x_{88} = -61.7828571247626$$
$$x_{89} = 90.0577556323905$$
$$x_{90} = 56.5467028432584$$
$$x_{91} = 74.3495317023222$$
$$x_{92} = 33.5070056915622$$
$$x_{93} = -81.6800486795727$$
$$x_{94} = 32.4597011595371$$
$$x_{95} = 96.3410214041938$$
$$x_{96} = 92.1521787755176$$
$$x_{97} = 24.0809299015658$$
Puntos de cruce con el eje de coordenadas Y
El gráfico cruce el eje Y cuando x es igual a 0:
sustituimos x = 0 en ((-x^2)*sin(3*x))/3 - x*cos(3*x)/9.
$$\frac{- 0^{2} \sin{\left(0 \cdot 3 \right)}}{3} - \frac{0 \cos{\left(0 \cdot 3 \right)}}{9}$$
Resultado:
$$f{\left(0 \right)} = 0$$
Punto:
(0, 0)
Extremos de la función
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
$$- x^{2} \cos{\left(3 x \right)} - \frac{x \sin{\left(3 x \right)}}{3} - \frac{\cos{\left(3 x \right)}}{9} = 0$$
Resolvermos esta ecuación
Raíces de esta ecuación
$$x_{1} = -56.0270520643964$$
$$x_{2} = -73.8289322990606$$
$$x_{3} = -114.669100816789$$
$$x_{4} = 29.8488520486946$$
$$x_{5} = -87.4422661799799$$
$$x_{6} = 100.008477139747$$
$$x_{7} = 66.4987153210636$$
$$x_{8} = 3.69494058387621$$
$$x_{9} = -41.3669890247317$$
$$x_{10} = -25.6606690465231$$
$$x_{11} = 34.0371844002289$$
$$x_{12} = -12.0519817702209$$
$$x_{13} = -16.2384006928906$$
$$x_{14} = -2.65892820916993$$
$$x_{15} = -75.9232858896629$$
$$x_{16} = 97.9141058007983$$
$$x_{17} = 84.3007208766022$$
$$x_{18} = -71.7345811321482$$
$$x_{19} = -17.2851845218587$$
$$x_{20} = -27.7547376575103$$
$$x_{21} = 67.5458869710398$$
$$x_{22} = -82.2063593514169$$
$$x_{23} = 89.536631561393$$
$$x_{24} = 48.6969676725019$$
$$x_{25} = 58.1213757157864$$
$$x_{26} = 18.3320155172131$$
$$x_{27} = 27.7547376575103$$
$$x_{28} = 91.6309983013506$$
$$x_{29} = 7.86806971409571$$
$$x_{30} = -51.8384220783646$$
$$x_{31} = 93.7253663087883$$
$$x_{32} = 62.3100374257891$$
$$x_{33} = -93.7253663087883$$
$$x_{34} = 80.1119995816952$$
$$x_{35} = -14.1450162722027$$
$$x_{36} = -60.2157043365755$$
$$x_{37} = -47.6498202537562$$
$$x_{38} = 36.1313903634628$$
$$x_{39} = -45.5555323285885$$
$$x_{40} = -69.6402326075599$$
$$x_{41} = 40.3198612113766$$
$$x_{42} = 60.2157043365755$$
$$x_{43} = 12.0519817702209$$
$$x_{44} = 5.77872929818664$$
$$x_{45} = -100.008477139747$$
$$x_{46} = 71.7345811321482$$
$$x_{47} = 24.6136555555456$$
$$x_{48} = 31.9430032243496$$
$$x_{49} = -80.1119995816952$$
$$x_{50} = -3.69494058387621$$
$$x_{51} = -84.3007208766022$$
$$x_{52} = 86.3950840295994$$
$$x_{53} = -65.4515444997783$$
$$x_{54} = -97.9141058007983$$
$$x_{55} = 20.4257900636467$$
$$x_{56} = 22.519679865973$$
$$x_{57} = 42.414120280404$$
$$x_{58} = -43.461254729693$$
$$x_{59} = 95.8197355006023$$
$$x_{60} = 51.8384220783646$$
$$x_{61} = 16.2384006928906$$
$$x_{62} = -31.9430032243496$$
$$x_{63} = 56.0270520643964$$
$$x_{64} = 1.63521988855805$$
$$x_{65} = -72.7817563995682$$
$$x_{66} = -29.8488520486946$$
$$x_{67} = 78.0176417087935$$
$$x_{68} = 73.8289322990606$$
$$x_{69} = -5.77872929818664$$
$$x_{70} = -36.1313903634628$$
$$x_{71} = -1.63521988855805$$
$$x_{72} = 9.9595163803989$$
$$x_{73} = -49.7441172014097$$
$$x_{74} = -21.4727226612174$$
$$x_{75} = 49.7441172014097$$
$$x_{76} = 44.5083921472895$$
$$x_{77} = -95.8197355006023$$
$$x_{78} = 14.1450162722027$$
$$x_{79} = -89.536631561393$$
$$x_{80} = -53.9327339611693$$
$$x_{81} = -9.9595163803989$$
$$x_{82} = -58.1213757157864$$
$$x_{83} = -91.6309983013506$$
$$x_{84} = -38.2256170425813$$
$$x_{85} = 88.4894486948401$$
$$x_{86} = 53.9327339611693$$
$$x_{87} = -67.5458869710398$$
$$x_{88} = -78.0176417087935$$
$$x_{89} = -63.3572055076081$$
$$x_{90} = -6.82301721004323$$
$$x_{91} = 82.2063593514169$$
$$x_{92} = -34.0371844002289$$
$$x_{93} = 64.4043745475981$$
$$x_{94} = 38.2256170425813$$
$$x_{95} = 75.9232858896629$$
$$x_{96} = -7.86806971409571$$
$$x_{97} = -23.5666584035319$$
Signos de extremos en los puntos:
(-56.02705206439635, -1046.2879692221)

(-73.82893229906057, 1816.8481947547)

(-114.669100816789, -4382.94533938785)

(29.848852048694557, -296.929113928501)

(-87.44226617997988, -2548.6610842219)

(100.00847713974731, 3333.84294556446)

(66.49871532106361, 1473.97082690375)

(3.694940583876211, 4.49615811036974)

(-41.3669890247317, -570.35371168148)

(-25.660669046523147, 219.434441044149)

(34.03718440022892, -386.121095286384)

(-12.051981770220895, -48.3612806282396)

(-16.2384006928906, -87.8397082936129)

(-2.6589282091699262, 2.30269633993739)

(-75.92328588966295, 1921.39289325802)

(97.91410580079831, 3195.66848393513)

(84.30072087660217, -2368.81495954748)

(-71.73458113214822, 1715.22782347844)

(-17.285184521858714, 99.5370186632834)

(-27.754737657510326, 256.71961394422)

(67.54588697103982, -1520.76006260566)

(-82.20635935141689, 2252.57295213321)

(89.53663156139297, 2672.21390970709)

(48.696967672501856, -790.409336265335)

(58.121375715786364, 1125.97588631175)

(18.332015517213136, 111.965410599411)

(27.754737657510326, -256.71961394422)

(91.63099830135059, 2798.69106242089)

(7.86806971409571, 20.5801418330152)

(-51.838422078364644, -895.685116705071)

(93.72536630878827, 2928.09254236343)

(62.31003742578914, 1294.12470215931)

(-93.72536630878827, -2928.09254236343)

(80.11199958169519, -2139.25527194702)

(-14.145016272202744, -66.6383319531075)

(-60.215704336575534, -1208.58813062382)

(-47.64982025375622, -756.779573059843)

(36.13139036346276, -435.103576704557)

(-45.555532328588534, -691.713292058457)

(-69.64023260755992, 1616.5317794289)

(40.31986121137662, -541.841521089288)

(60.215704336575534, 1208.58813062382)

(12.051981770220895, 48.3612806282396)

(5.7787292981866445, 11.0760336568331)

(-100.00847713974731, -3333.84294556446)

(71.73458113214822, -1715.22782347844)

(24.61365555554561, 201.888477234723)

(31.94300322434958, -340.062941033913)

(-80.11199958169519, 2139.25527194702)

(-3.694940583876211, -4.49615811036974)

(-84.30072087660217, 2368.81495954748)

(86.39508402959937, -2487.98129418999)

(-65.45154449977834, 1427.91267300824)

(-97.91410580079831, -3195.66848393513)

(20.425790063646744, 139.01543936081)

(22.519679865972986, 168.989794851678)

(42.414120280403964, -599.596984073835)

(-43.46125472969303, -629.57133826705)

(95.81973550060226, 3060.41834953481)

(51.838422078364644, 895.685116705071)

(16.2384006928906, 87.8397082936129)

(-31.94300322434958, 340.062941033913)

(56.02705206439635, 1046.2879692221)

(1.6352198885580493, 0.839822205163174)

(-72.78175639956821, -1765.67246821321)

(-29.848852048694557, 296.929113928501)

(78.01764170879352, -2028.8619189887)

(73.82893229906057, -1816.8481947547)

(-5.7787292981866445, -11.0760336568331)

(-36.13139036346276, 435.103576704557)

(-1.6352198885580493, -0.839822205163174)

(9.959516380398895, 33.0085522779887)

(-49.74411720140972, -824.770181274501)

(-21.472722661217425, 153.637076253038)

(49.74411720140972, 824.770181274501)

(44.508392147289506, -660.276774261742)

(-95.81973550060226, -3060.41834953481)

(14.145016272202744, 66.6383319531075)

(-89.53663156139297, -2672.21390970709)

(-53.93273396116928, -969.524379353689)

(-9.959516380398895, -33.0085522779887)

(-58.121375715786364, -1125.97588631175)

(-91.63099830135059, -2798.69106242089)

(-38.225617042581284, 487.010385302117)

(88.4894486948401, -2610.07195606092)

(53.93273396116928, 969.524379353689)

(-67.54588697103982, 1520.76006260566)

(-78.01764170879352, 2028.8619189887)

(-63.35720550760808, 1337.9896106361)

(-6.823017210043231, 15.4625519055157)

(82.20635935141689, -2252.57295213321)

(-34.03718440022892, 386.121095286384)

(64.40437454759808, 1382.58560091905)

(38.225617042581284, -487.010385302117)

(75.92328588966295, -1921.39289325802)

(-7.86806971409571, -20.5801418330152)

(-23.566658403531857, 185.073595174274)


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:
$$x_{1} = -56.0270520643964$$
$$x_{2} = -114.669100816789$$
$$x_{3} = 29.8488520486946$$
$$x_{4} = -87.4422661799799$$
$$x_{5} = -41.3669890247317$$
$$x_{6} = 34.0371844002289$$
$$x_{7} = -12.0519817702209$$
$$x_{8} = -16.2384006928906$$
$$x_{9} = 84.3007208766022$$
$$x_{10} = 67.5458869710398$$
$$x_{11} = 48.6969676725019$$
$$x_{12} = 27.7547376575103$$
$$x_{13} = -51.8384220783646$$
$$x_{14} = -93.7253663087883$$
$$x_{15} = 80.1119995816952$$
$$x_{16} = -14.1450162722027$$
$$x_{17} = -60.2157043365755$$
$$x_{18} = -47.6498202537562$$
$$x_{19} = 36.1313903634628$$
$$x_{20} = -45.5555323285885$$
$$x_{21} = 40.3198612113766$$
$$x_{22} = -100.008477139747$$
$$x_{23} = 71.7345811321482$$
$$x_{24} = 31.9430032243496$$
$$x_{25} = -3.69494058387621$$
$$x_{26} = 86.3950840295994$$
$$x_{27} = -97.9141058007983$$
$$x_{28} = 42.414120280404$$
$$x_{29} = -43.461254729693$$
$$x_{30} = -72.7817563995682$$
$$x_{31} = 78.0176417087935$$
$$x_{32} = 73.8289322990606$$
$$x_{33} = -5.77872929818664$$
$$x_{34} = -1.63521988855805$$
$$x_{35} = -49.7441172014097$$
$$x_{36} = 44.5083921472895$$
$$x_{37} = -95.8197355006023$$
$$x_{38} = -89.536631561393$$
$$x_{39} = -53.9327339611693$$
$$x_{40} = -9.9595163803989$$
$$x_{41} = -58.1213757157864$$
$$x_{42} = -91.6309983013506$$
$$x_{43} = 88.4894486948401$$
$$x_{44} = 82.2063593514169$$
$$x_{45} = 38.2256170425813$$
$$x_{46} = 75.9232858896629$$
$$x_{47} = -7.86806971409571$$
Puntos máximos de la función:
$$x_{47} = -73.8289322990606$$
$$x_{47} = 100.008477139747$$
$$x_{47} = 66.4987153210636$$
$$x_{47} = 3.69494058387621$$
$$x_{47} = -25.6606690465231$$
$$x_{47} = -2.65892820916993$$
$$x_{47} = -75.9232858896629$$
$$x_{47} = 97.9141058007983$$
$$x_{47} = -71.7345811321482$$
$$x_{47} = -17.2851845218587$$
$$x_{47} = -27.7547376575103$$
$$x_{47} = -82.2063593514169$$
$$x_{47} = 89.536631561393$$
$$x_{47} = 58.1213757157864$$
$$x_{47} = 18.3320155172131$$
$$x_{47} = 91.6309983013506$$
$$x_{47} = 7.86806971409571$$
$$x_{47} = 93.7253663087883$$
$$x_{47} = 62.3100374257891$$
$$x_{47} = -69.6402326075599$$
$$x_{47} = 60.2157043365755$$
$$x_{47} = 12.0519817702209$$
$$x_{47} = 5.77872929818664$$
$$x_{47} = 24.6136555555456$$
$$x_{47} = -80.1119995816952$$
$$x_{47} = -84.3007208766022$$
$$x_{47} = -65.4515444997783$$
$$x_{47} = 20.4257900636467$$
$$x_{47} = 22.519679865973$$
$$x_{47} = 95.8197355006023$$
$$x_{47} = 51.8384220783646$$
$$x_{47} = 16.2384006928906$$
$$x_{47} = -31.9430032243496$$
$$x_{47} = 56.0270520643964$$
$$x_{47} = 1.63521988855805$$
$$x_{47} = -29.8488520486946$$
$$x_{47} = -36.1313903634628$$
$$x_{47} = 9.9595163803989$$
$$x_{47} = -21.4727226612174$$
$$x_{47} = 49.7441172014097$$
$$x_{47} = 14.1450162722027$$
$$x_{47} = -38.2256170425813$$
$$x_{47} = 53.9327339611693$$
$$x_{47} = -67.5458869710398$$
$$x_{47} = -78.0176417087935$$
$$x_{47} = -63.3572055076081$$
$$x_{47} = -6.82301721004323$$
$$x_{47} = -34.0371844002289$$
$$x_{47} = 64.4043745475981$$
$$x_{47} = -23.5666584035319$$
Decrece en los intervalos
$$\left[88.4894486948401, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -114.669100816789\right]$$
Puntos de flexiones
Hallemos los puntos de flexiones, para eso hay que resolver la ecuación
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = 0$$
(la segunda derivada es igual a cero),
las raíces de la ecuación obtenida serán los puntos de flexión para el gráfico de la función indicado:
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = $$
segunda derivada
$$3 x \left(x \sin{\left(3 x \right)} - \cos{\left(3 x \right)}\right) = 0$$
Resolvermos esta ecuación
Raíces de esta ecuación
$$x_{1} = 35.6140738778055$$
$$x_{2} = 76.4497811494308$$
$$x_{3} = -24.0993673689024$$
$$x_{4} = 43.9898733469416$$
$$x_{5} = 28.2861133220207$$
$$x_{6} = 65.9784974896013$$
$$x_{7} = -48.1780051482371$$
$$x_{8} = -76.4497811494308$$
$$x_{9} = -28.2861133220207$$
$$x_{10} = 37.707949640576$$
$$x_{11} = -85.8740806751012$$
$$x_{12} = 94.2513161188011$$
$$x_{13} = 6.33536942913212$$
$$x_{14} = 70.1669861807712$$
$$x_{15} = 26.1926588142083$$
$$x_{16} = 10.5036152522253$$
$$x_{17} = -72.2612436304152$$
$$x_{18} = 19.9134785044576$$
$$x_{19} = -90.0626903764695$$
$$x_{20} = -46.0839242979739$$
$$x_{21} = -15.7291268910972$$
$$x_{22} = 96.3456343516823$$
$$x_{23} = 4.26554946342714$$
$$x_{24} = -52.3662422102135$$
$$x_{25} = -93.2041582976202$$
$$x_{26} = -32.4733856603804$$
$$x_{27} = 0$$
$$x_{28} = -13.6379660750977$$
$$x_{29} = -33.5202629236288$$
$$x_{30} = -57.6016516056539$$
$$x_{31} = 78.5440600129688$$
$$x_{32} = 92.1570013791839$$
$$x_{33} = 56.5545611637268$$
$$x_{34} = 41.8958567736753$$
$$x_{35} = 50.2721121645408$$
$$x_{36} = -65.9784974896013$$
$$x_{37} = 30.3796972645556$$
$$x_{38} = 83.7797825914274$$
$$x_{39} = -50.2721121645408$$
$$x_{40} = 74.3555088322562$$
$$x_{41} = -30.3796972645556$$
$$x_{42} = 72.2612436304152$$
$$x_{43} = 52.3662422102135$$
$$x_{44} = 63.8842679655846$$
$$x_{45} = -83.7797825914274$$
$$x_{46} = 59.6958437576497$$
$$x_{47} = 8.41699804179055$$
$$x_{48} = 61.7900496615313$$
$$x_{49} = 12.5927853663189$$
$$x_{50} = -1.2695874063999$$
$$x_{51} = -37.707949640576$$
$$x_{52} = -92.1570013791839$$
$$x_{53} = 87.9683833774906$$
$$x_{54} = -94.2513161188011$$
$$x_{55} = -99.4871177683877$$
$$x_{56} = 2.23465192526025$$
$$x_{57} = 27.2393680284524$$
$$x_{58} = 90.0626903764695$$
$$x_{59} = -43.9898733469416$$
$$x_{60} = -79.5912017381884$$
$$x_{61} = 98.4399558549167$$
$$x_{62} = -47.1309612345576$$
$$x_{63} = 17.8210432548636$$
$$x_{64} = -70.1669861807712$$
$$x_{65} = 54.4603926305593$$
$$x_{66} = -35.6140738778055$$
$$x_{67} = -68.0727371985178$$
$$x_{68} = -61.7900496615313$$
$$x_{69} = -19.9134785044576$$
$$x_{70} = 86.9212314698167$$
$$x_{71} = -26.1926588142083$$
$$x_{72} = -9.45988409704047$$
$$x_{73} = -5.29817102122807$$
$$x_{74} = 22.0062853496724$$
$$x_{75} = -81.6854894816184$$
$$x_{76} = -59.6958437576497$$
$$x_{77} = 15.7291268910972$$
$$x_{78} = 68.0727371985178$$
$$x_{79} = 48.1780051482371$$
$$x_{80} = 85.8740806751012$$
$$x_{81} = 39.8018799977587$$
$$x_{82} = -55.5074747610846$$
$$x_{83} = -39.8018799977587$$
$$x_{84} = -87.9683833774906$$
$$x_{85} = 24.0993673689024$$
$$x_{86} = 32.4733856603804$$
$$x_{87} = -11.5479663465422$$
$$x_{88} = 46.0839242979739$$
$$x_{89} = -41.8958567736753$$
$$x_{90} = -63.8842679655846$$
$$x_{91} = -17.8210432548636$$
$$x_{92} = 100.534280424163$$
$$x_{93} = -77.4969197960636$$
$$x_{94} = -22.0062853496724$$
$$x_{95} = -3.2413424920585$$

Intervalos de convexidad y concavidad:
Hallemos los intervales donde la función es convexa o cóncava, para eso veamos cómo se comporta la función en los puntos de flexiones:
Cóncava en los intervalos
$$\left[100.534280424163, \infty\right)$$
Convexa en los intervalos
$$\left(-\infty, -94.2513161188011\right]$$
Asíntotas horizontales
Hallemos las asíntotas horizontales mediante los límites de esta función con x->+oo y x->-oo
True

Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la izquierda:
$$y = \lim_{x \to -\infty}\left(- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3}\right)$$
True

Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la derecha:
$$y = \lim_{x \to \infty}\left(- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3}\right)$$
Asíntotas inclinadas
Se puede hallar la asíntota inclinada calculando el límite de la función ((-x^2)*sin(3*x))/3 - x*cos(3*x)/9, dividida por x con x->+oo y x ->-oo
True

Tomamos como el límite
es decir,
ecuación de la asíntota inclinada a la izquierda:
$$y = x \lim_{x \to -\infty}\left(\frac{- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3}}{x}\right)$$
True

Tomamos como el límite
es decir,
ecuación de la asíntota inclinada a la derecha:
$$y = x \lim_{x \to \infty}\left(\frac{- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3}}{x}\right)$$
Paridad e imparidad de la función
Comprobemos si la función es par o impar mediante las relaciones f = f(-x) и f = -f(-x).
Pues, comprobamos:
$$- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3} = \frac{x^{2} \sin{\left(3 x \right)}}{3} + \frac{x \cos{\left(3 x \right)}}{9}$$
- No
$$- \frac{x \cos{\left(3 x \right)}}{9} + \frac{- x^{2} \sin{\left(3 x \right)}}{3} = - \frac{x^{2} \sin{\left(3 x \right)}}{3} - \frac{x \cos{\left(3 x \right)}}{9}$$
- No
es decir, función
no es
par ni impar
Gráfico
Gráfico de la función y = -x^2*sin(3*x)/3-x*cos(3*x)/9