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Trazado el gráfico de la función/ acot(x)*x

Gráfico de la función y = acot(x)*x

v

Gráfico:

interior superior

Puntos de intersección:

mostrar?

Definida a trozos:

Solución

Ha introducido [src] 
f(x) = acot(x)*x
f(x)=xacot⁡(x)f{\left(x \right)} = x \operatorname{acot}{\left(x \right)} 
f = x*acot(x)
Gráfico de la función
02468-8-6-4-2-101002
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:
xacot⁡(x)=0x \operatorname{acot}{\left(x \right)} = 0
Resolvermos esta ecuación
Puntos de cruce con el eje X:

Solución analítica
x1=0x_{1} = 0
Solución numérica
x1=0x_{1} = 0
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 acot(x)*x.
0acot⁡(0)0 \operatorname{acot}{\left(0 \right)}
Resultado:
f(0)=0f{\left(0 \right)} = 0
Punto:
(0, 0)
Extremos de la función
Para hallar los extremos hay que resolver la ecuación
ddxf(x)=0\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:
ddxf(x)=\frac{d}{d x} f{\left(x \right)} =
primera derivada
−xx2+1+acot⁡(x)=0- \frac{x}{x^{2} + 1} + \operatorname{acot}{\left(x \right)} = 0
Resolvermos esta ecuación
Raíces de esta ecuación
x1=18717.3825921039x_{1} = 18717.3825921039
x2=−41469.0097027937x_{2} = -41469.0097027937
x3=−27908.3228655288x_{3} = -27908.3228655288
x4=−21128.451639271x_{4} = -21128.451639271
x5=39057.5547154358x_{5} = 39057.5547154358
x6=28887.0585662606x_{6} = 28887.0585662606
x7=42447.8004663952x_{7} = 42447.8004663952
x8=29734.5801929714x_{8} = 29734.5801929714
x9=41600.2364126928x_{9} = 41600.2364126928
x10=23802.0523520614x_{10} = 23802.0523520614
x11=−28755.8386877142x_{11} = -28755.8386877142
x12=−40621.447587593x_{12} = -40621.447587593
x13=−19433.5887869564x_{13} = -19433.5887869564
x14=10245.0412006996x_{14} = 10245.0412006996
x15=22107.1135839482x_{15} = 22107.1135839482
x16=−29603.3595724168x_{16} = -29603.3595724168
x17=39905.113426091x_{17} = 39905.113426091
x18=−10960.8778764425x_{18} = -10960.8778764425
x19=−14349.4901108771x_{19} = -14349.4901108771
x20=19564.7930550097x_{20} = 19564.7930550097
x21=−32993.4859340089x_{21} = -32993.4859340089
x22=21259.6603274632x_{22} = 21259.6603274632
x23=−25365.810848258x_{23} = -25365.810848258
x24=−30450.8850969459x_{24} = -30450.8850969459
x25=36514.8912641685x_{25} = 36514.8912641685
x26=−11807.9338157736x_{26} = -11807.9338157736
x27=−33841.0266214391x_{27} = -33841.0266214391
x28=−16044.0821523617x_{28} = -16044.0821523617
x29=8551.45303022722x_{29} = 8551.45303022722
x30=35667.3415095204x_{30} = 35667.3415095204
x31=−31298.4148843908x_{31} = -31298.4148843908
x32=−42316.5735052903x_{32} = -42316.5735052903
x33=17869.99050832x_{33} = 17869.99050832
x34=−9267.06673722176x_{34} = -9267.06673722176
x35=17022.6195482377x_{35} = 17022.6195482377
x36=−37231.2183043527x_{36} = -37231.2183043527
x37=33124.7089739066x_{37} = 33124.7089739066
x38=−12655.0631680385x_{38} = -12655.0631680385
x39=31429.6368125843x_{39} = 31429.6368125843
x40=9398.17409812154x_{40} = 9398.17409812154
x41=27192.0307619732x_{41} = 27192.0307619732
x42=26344.5255783821x_{42} = 26344.5255783821
x43=−26213.3083727677x_{43} = -26213.3083727677
x44=12786.2285767811x_{44} = 12786.2285767811
x45=20412.2196081348x_{45} = 20412.2196081348
x46=−32145.9485975863x_{46} = -32145.9485975863
x47=−18586.1809993501x_{47} = -18586.1809993501
x48=28039.5419336107x_{48} = 28039.5419336107
x49=11939.0892257274x_{49} = 11939.0892257274
x50=22954.5779890773x_{50} = 22954.5779890773
x51=38209.9980244722x_{51} = 38209.9980244722
x52=16175.2730314267x_{52} = 16175.2730314267
x53=37362.4434906472x_{53} = 37362.4434906472
x54=−10113.913790961x_{54} = -10113.913790961
x55=33972.2501557217x_{55} = 33972.2501557217
x56=−8420.37201352502x_{56} = -8420.37201352502
x57=−35536.1170902848x_{57} = -35536.1170902848
x58=13633.4257117535x_{58} = 13633.4257117535
x59=−13502.2521178288x_{59} = -13502.2521178288
x60=−16891.4245591221x_{60} = -16891.4245591221
x61=−21975.9030580391x_{61} = -21975.9030580391
x62=30582.10639855x_{62} = 30582.10639855
x63=−36383.6664480288x_{63} = -36383.6664480288
x64=32277.1711035644x_{64} = 32277.1711035644
x65=−23670.8387235676x_{65} = -23670.8387235676
x66=−24518.3207010738x_{66} = -24518.3207010738
x67=40752.6740304247x_{67} = 40752.6740304247
x68=−27060.8125814987x_{68} = -27060.8125814987
x69=−17738.7919818582x_{69} = -17738.7919818582
x70=34819.7944072015x_{70} = 34819.7944072015
x71=25497.0269799384x_{71} = 25497.0269799384
x72=15327.9550113123x_{72} = 15327.9550113123
x73=−38926.3288599295x_{73} = -38926.3288599295
x74=−39773.8872675524x_{74} = -39773.8872675524
x75=−22823.365825763x_{75} = -22823.365825763
x76=−34688.5704142599x_{76} = -34688.5704142599
x77=−15196.7689456217x_{77} = -15196.7689456217
x78=−38078.7724924216x_{78} = -38078.7724924216
x79=24649.5356458528x_{79} = 24649.5356458528
x80=11092.020896022x_{80} = 11092.020896022
x81=−20281.012992025x_{81} = -20281.012992025
x82=14480.6704897809x_{82} = 14480.6704897809
Signos de extremos en los puntos:
(18717.38259210387, 0.999999999048545)

(-41469.00970279369, 0.999999999806165)

(-27908.322865528775, 0.999999999572032)

(-21128.451639271025, 0.999999999253305)

(39057.55471543576, 0.999999999781491)

(28887.058566260628, 0.999999999600541)

(42447.8004663952, 0.999999999815001)

(29734.580192971367, 0.999999999622988)

(41600.23641269277, 0.999999999807386)

(23802.052352061375, 0.999999999411631)

(-28755.838687714244, 0.999999999596887)

(-40621.447587593044, 0.999999999797992)

(-19433.58878695641, 0.999999999117382)

(10245.041200699563, 0.999999996824213)

(22107.113583948245, 0.999999999317952)

(-29603.35957241684, 0.999999999619638)

(39905.113426091, 0.999999999790675)

(-10960.87787644252, 0.999999997225479)

(-14349.490110877094, 0.999999998381153)

(19564.79305500968, 0.99999999912918)

(-32993.48593400886, 0.999999999693788)

(21259.66032746322, 0.999999999262493)

(-25365.810848258036, 0.999999999481939)

(-30450.88509694595, 0.999999999640517)

(36514.89126416845, 0.999999999750001)

(-11807.933815773578, 0.999999997609268)

(-33841.02662143908, 0.999999999708934)

(-16044.082152361707, 0.999999998705062)

(8551.453030227216, 0.999999995441742)

(35667.3415095204, 0.999999999737978)

(-31298.41488439077, 0.999999999659722)

(-42316.573505290275, 0.999999999813852)

(17869.990508320032, 0.999999998956169)

(-9267.06673722176, 0.999999996118549)

(17022.619548237748, 0.999999998849661)

(-37231.21830435275, 0.999999999759528)

(33124.7089739066, 0.999999999696209)

(-12655.063168038458, 0.999999997918626)

(31429.636812584253, 0.999999999662557)

(9398.174098121537, 0.999999996226088)

(27192.03076197315, 0.999999999549188)

(26344.525578382065, 0.999999999519716)

(-26213.308372767653, 0.999999999514896)

(12786.228576781117, 0.99999999796111)

(20412.219608134823, 0.999999999199985)

(-32145.948597586266, 0.999999999677428)

(-18586.180999350086, 0.999999999035064)

(28039.541933610733, 0.999999999576028)

(11939.089225727435, 0.999999997661506)

(22954.57798907731, 0.999999999367384)

(38209.99802447215, 0.99999999977169)

(16175.273031426721, 0.999999998725982)

(37362.44349064715, 0.999999999761214)

(-10113.913790961042, 0.999999996741331)

(33972.25015572168, 0.999999999711178)

(-8420.37201352502, 0.999999995298719)

(-35536.11709028476, 0.99999999973604)

(13633.425711753476, 0.999999998206635)

(-13502.25211782884, 0.999999998171621)

(-16891.424559122082, 0.999999998831722)

(-21975.903058039054, 0.999999999309784)

(30582.106398549957, 0.999999999643595)

(-36383.66644802879, 0.999999999748194)

(32277.171103564393, 0.999999999680046)

(-23670.838723567595, 0.99999999940509)

(-24518.320701073833, 0.999999999445505)

(40752.67403042468, 0.999999999799291)

(-27060.81258149867, 0.999999999544805)

(-17738.791981858223, 0.999999998940671)

(34819.79440720148, 0.999999999725067)

(25497.02697993837, 0.999999999487257)

(15327.955011312279, 0.999999998581235)

(-38926.32885992955, 0.999999999780016)

(-39773.887267552374, 0.999999999789291)

(-22823.365825763038, 0.999999999360089)

(-34688.570414259906, 0.999999999722983)

(-15196.768945621745, 0.999999998556635)

(-38078.77249242158, 0.999999999770114)

(24649.53564585282, 0.999999999451393)

(11092.020896021957, 0.999999997290698)

(-20281.012992024975, 0.9999999991896)

(14480.670489780925, 0.99999999841035)


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=−40621.447587593x_{1} = -40621.447587593
x2=−14349.4901108771x_{2} = -14349.4901108771
x3=−32993.4859340089x_{3} = -32993.4859340089
x4=−42316.5735052903x_{4} = -42316.5735052903
x5=17022.6195482377x_{5} = 17022.6195482377
x6=31429.6368125843x_{6} = 31429.6368125843
x7=−26213.3083727677x_{7} = -26213.3083727677
x8=32277.1711035644x_{8} = 32277.1711035644
x9=40752.6740304247x_{9} = 40752.6740304247
x10=25497.0269799384x_{10} = 25497.0269799384
x11=−22823.365825763x_{11} = -22823.365825763
x12=−38078.7724924216x_{12} = -38078.7724924216
x13=24649.5356458528x_{13} = 24649.5356458528
x14=14480.6704897809x_{14} = 14480.6704897809
Puntos máximos de la función:
x14=18717.3825921039x_{14} = 18717.3825921039
x14=39057.5547154358x_{14} = 39057.5547154358
x14=10245.0412006996x_{14} = 10245.0412006996
x14=22107.1135839482x_{14} = 22107.1135839482
x14=−16044.0821523617x_{14} = -16044.0821523617
x14=−37231.2183043527x_{14} = -37231.2183043527
x14=−32145.9485975863x_{14} = -32145.9485975863
x14=11939.0892257274x_{14} = 11939.0892257274
x14=38209.9980244722x_{14} = 38209.9980244722
x14=37362.4434906472x_{14} = 37362.4434906472
x14=−16891.4245591221x_{14} = -16891.4245591221
x14=34819.7944072015x_{14} = 34819.7944072015
Decrece en los intervalos
[40752.6740304247,∞)\left[40752.6740304247, \infty\right)
Crece en los intervalos
(−∞,−42316.5735052903]\left(-\infty, -42316.5735052903\right]
Puntos de flexiones
Hallemos los puntos de flexiones, para eso hay que resolver la ecuación
d2dx2f(x)=0\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:
d2dx2f(x)=\frac{d^{2}}{d x^{2}} f{\left(x \right)} =
segunda derivada
2(x2x2+1−1)x2+1=0\frac{2 \left(\frac{x^{2}}{x^{2} + 1} - 1\right)}{x^{2} + 1} = 0
Resolvermos esta ecuación
Soluciones no halladas,
tal vez la función no tenga flexiones
Asíntotas horizontales
Hallemos las asíntotas horizontales mediante los límites de esta función con x->+oo y x->-oo
lim⁡x→−∞(xacot⁡(x))=1\lim_{x \to -\infty}\left(x \operatorname{acot}{\left(x \right)}\right) = 1
Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la izquierda:
y=1y = 1
lim⁡x→∞(xacot⁡(x))=1\lim_{x \to \infty}\left(x \operatorname{acot}{\left(x \right)}\right) = 1
Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la derecha:
y=1y = 1
Asíntotas inclinadas
Se puede hallar la asíntota inclinada calculando el límite de la función acot(x)*x, dividida por x con x->+oo y x ->-oo
lim⁡x→−∞acot⁡(x)=0\lim_{x \to -\infty} \operatorname{acot}{\left(x \right)} = 0
Tomamos como el límite
es decir,
la inclinada coincide con la asíntota horizontal a la derecha
lim⁡x→∞acot⁡(x)=0\lim_{x \to \infty} \operatorname{acot}{\left(x \right)} = 0
Tomamos como el límite
es decir,
la inclinada coincide con la asíntota horizontal a la izquierda
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:
xacot⁡(x)=xacot⁡(x)x \operatorname{acot}{\left(x \right)} = x \operatorname{acot}{\left(x \right)}
- No
xacot⁡(x)=−xacot⁡(x)x \operatorname{acot}{\left(x \right)} = - x \operatorname{acot}{\left(x \right)}
- No
es decir, función
no es
par ni impar
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