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Gráfico de la función y = sin(x)-cos(x^2)+(1/4)

v

Gráfico:

interior superior

Puntos de intersección:

mostrar?

Definida a trozos:

Solución

Ha introducido [src]
                   / 2\   1
f(x) = sin(x) - cos\x / + -
                          4
$$f{\left(x \right)} = \left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4}$$
f = sin(x) - cos(x^2) + 1/4
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:
$$\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4} = 0$$
Resolvermos esta ecuación
Puntos de cruce con el eje X:

Solución numérica
$$x_{1} = 40.1111824792713$$
$$x_{2} = -43.4238638224173$$
$$x_{3} = -9.65261285774575$$
$$x_{4} = -33.6919704330286$$
$$x_{5} = -78.6622401239618$$
$$x_{6} = 90.9385101983754$$
$$x_{7} = 54.3623963985464$$
$$x_{8} = -27.9964832675147$$
$$x_{9} = -69.7503172817115$$
$$x_{10} = 43.3212314723419$$
$$x_{11} = 0.691602448121161$$
$$x_{12} = -85.2944255047074$$
$$x_{13} = 73.876051319832$$
$$x_{14} = 6.24917558715415$$
$$x_{15} = 6.69651557104387$$
$$x_{16} = -24.7044915641557$$
$$x_{17} = 35.5686851346348$$
$$x_{18} = 25.4584447108766$$
$$x_{19} = -90.0071782775614$$
$$x_{20} = 21.8260959682456$$
$$x_{21} = -21.8848905883197$$
$$x_{22} = 68.2643913788867$$
$$x_{23} = 169.844666479171$$
$$x_{24} = -22.1635753055404$$
$$x_{25} = 2.42010171228507$$
$$x_{26} = 77.7441722010558$$
$$x_{27} = 98.2500719411958$$
$$x_{28} = -3.64841219611475$$
$$x_{29} = -25.9689454826438$$
$$x_{30} = -26.9248773198902$$
$$x_{31} = 34.0823189250325$$
$$x_{32} = 12.8221133045797$$
$$x_{33} = -47.7516263856737$$
$$x_{34} = -83.7139403250785$$
$$x_{35} = -1.55520891280466$$
$$x_{36} = -59.7503539523153$$
$$x_{37} = 40.9764116446742$$
$$x_{38} = 75.5244784928168$$
$$x_{39} = -11.7485351246587$$
$$x_{40} = -68.4142549325336$$
$$x_{41} = -90.8892327693225$$
$$x_{42} = 72.2496786240861$$
$$x_{43} = 68.2491628376529$$
$$x_{44} = -83.385133658414$$
$$x_{45} = -53.7697549442524$$
$$x_{46} = -10.05512490128$$
$$x_{47} = 30.2496446403622$$
$$x_{48} = -71.8104575408252$$
$$x_{49} = 28.0065685403739$$
$$x_{50} = -77.8794998506028$$
$$x_{51} = -97.5392361785001$$
$$x_{52} = 879.359550496925$$
$$x_{53} = -1.99782462685321$$
$$x_{54} = -21.8180927772482$$
$$x_{55} = 99.8040429118756$$
$$x_{56} = 4.0847382487479$$
$$x_{57} = -108.268255492474$$
$$x_{58} = 10.2347083141931$$
$$x_{59} = -18.5625074499192$$
$$x_{60} = 37.4528358578611$$
$$x_{61} = 367.362811896333$$
$$x_{62} = 65.5028621304597$$
$$x_{63} = 29.5130989528393$$
$$x_{64} = 87.9748646153398$$
$$x_{65} = 16.0000573107138$$
$$x_{66} = -24.4413856207385$$
$$x_{67} = 91.042700967986$$
$$x_{68} = -70.7821345465067$$
$$x_{69} = 94.3172556650567$$
$$x_{70} = 75.2503680674066$$
$$x_{71} = 82.3790523264691$$
$$x_{72} = -65.7124580075391$$
$$x_{73} = -45.4396168381865$$
$$x_{74} = 48.9030352869289$$
$$x_{75} = -55.9999908638865$$
$$x_{76} = -7.77289829567417$$
$$x_{77} = 25.6982715775585$$
$$x_{78} = 50.8848029425982$$
$$x_{79} = 37.7494005448309$$
$$x_{80} = -88.5267746421002$$
$$x_{81} = -93.9621491488001$$
$$x_{82} = -39.819348570996$$
$$x_{83} = -57.3069117873017$$
$$x_{84} = 35.5945980633381$$
$$x_{85} = 8.99137215079902$$
$$x_{86} = 106.101278877099$$
$$x_{87} = 23.829670676031$$
$$x_{88} = 61.0083417543066$$
$$x_{89} = -43.9055787200602$$
$$x_{90} = 13.2449784557428$$
$$x_{91} = -37.7847675885331$$
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 sin(x) - cos(x^2) + 1/4.
$$\left(- \cos{\left(0^{2} \right)} + \sin{\left(0 \right)}\right) + \frac{1}{4}$$
Resultado:
$$f{\left(0 \right)} = - \frac{3}{4}$$
Punto:
(0, -3/4)
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
$$2 x \sin{\left(x^{2} \right)} + \cos{\left(x \right)} = 0$$
Resolvermos esta ecuación
Raíces de esta ecuación
$$x_{1} = 22.349323885059$$
$$x_{2} = -47.4608457084011$$
$$x_{3} = -22.4903520904245$$
$$x_{4} = 6.3967526067572$$
$$x_{5} = 56.2735892190937$$
$$x_{6} = 96.0892263352259$$
$$x_{7} = -99.1940994186411$$
$$x_{8} = 42.2424741036786$$
$$x_{9} = 52.2497863224473$$
$$x_{10} = -43.8482155265515$$
$$x_{11} = -7.72541014397883$$
$$x_{12} = -19.816274863823$$
$$x_{13} = 90.6554540354125$$
$$x_{14} = -0.730978270667906$$
$$x_{15} = -9.87092112794122$$
$$x_{16} = 28.2485792398582$$
$$x_{17} = 14.7224702337865$$
$$x_{18} = -41.8314912305025$$
$$x_{19} = 98.0953333197619$$
$$x_{20} = -74.0622869224726$$
$$x_{21} = 87.7857185656868$$
$$x_{22} = -81.840586323002$$
$$x_{23} = -5.87191528001199$$
$$x_{24} = 87.8035463465879$$
$$x_{25} = 66.3427786515794$$
$$x_{26} = -72.1935532053449$$
$$x_{27} = -77.7257170387604$$
$$x_{28} = -83.9440058712679$$
$$x_{29} = 64.2499148858234$$
$$x_{30} = 16.2456215982105$$
$$x_{31} = -61.8584222114262$$
$$x_{32} = -39.7914116037745$$
$$x_{33} = 18.2479103002405$$
$$x_{34} = 69.3298616312379$$
$$x_{35} = 93.7559147144186$$
$$x_{36} = -53.8778557584569$$
$$x_{37} = 8.12140237825279$$
$$x_{38} = 29.2322260727598$$
$$x_{39} = 1.75748767956681$$
$$x_{40} = 79.7604098082138$$
$$x_{41} = -3.97400948361753$$
$$x_{42} = 27.2863953811205$$
$$x_{43} = 82.2044467599582$$
$$x_{44} = 60.885813954976$$
$$x_{45} = -15.3508947858058$$
$$x_{46} = 11.0691206807264$$
$$x_{47} = -15.7549206941732$$
$$x_{48} = 47.2616324020612$$
$$x_{49} = 46.1858745664205$$
$$x_{50} = -33.8628507747295$$
$$x_{51} = -46.928316630699$$
$$x_{52} = -1.78948236293348$$
$$x_{53} = -65.5808461895275$$
$$x_{54} = -51.1560410192306$$
$$x_{55} = 36.7972126661047$$
$$x_{56} = -91.9286709217352$$
$$x_{57} = 22.1384461152026$$
$$x_{58} = 6.13338537866179$$
$$x_{59} = -87.1571856052754$$
$$x_{60} = 3.95230187084535$$
$$x_{61} = 85.4278345722129$$
$$x_{62} = 57.5433221417068$$
$$x_{63} = -89.7498878995054$$
$$x_{64} = 48.1833155017359$$
$$x_{65} = 78.44981619248$$
$$x_{66} = -72.106467795218$$
$$x_{67} = 9.71067451011131$$
$$x_{68} = -11.621672446497$$
$$x_{69} = -40.1453184602676$$
$$x_{70} = -17.9879387647864$$
$$x_{71} = -89.8897901584974$$
$$x_{72} = -14.0683294162172$$
$$x_{73} = -22.0673844234238$$
$$x_{74} = 99.6364875148062$$
$$x_{75} = 44.7697244998911$$
$$x_{76} = 80.3686064857456$$
$$x_{77} = 94.1405234555763$$
$$x_{78} = 31.2578168207404$$
$$x_{79} = -49.2792605670951$$
$$x_{80} = -55.8533314248926$$
$$x_{81} = 57.7341585233858$$
$$x_{82} = -95.8600997718734$$
Signos de extremos en los puntos:
(22.34932388505898, 0.899214550998202)

(-47.46084570840113, 1.58056628769818)

(-22.490352090424498, 1.7285358978664)

(6.396752606757205, 1.36030314711518)

(56.27358921909367, -1.02158596885626)

(96.08922633522592, 2.21359624249138)

(-99.19409941864106, 0.222763416653808)

(42.242474103678596, -1.73574697954699)

(52.24978632244733, 2.16570965376942)

(-43.848215526551456, -0.616255911808996)

(-7.725410143978831, 0.258219501823969)

(-19.816274863823022, 0.426870799296581)

(90.65545403541253, -0.31436230477943)

(-0.7309782706679064, -1.27820871872329)

(-9.87092112794122, 1.68044483800528)

(28.24857923985821, -0.724091651171351)

(14.722470233786547, 2.0833685437479)

(-41.831491230502486, 2.08643593813823)

(98.09533331976195, 0.601226993957887)

(-74.06228692247262, 0.222548265536392)

(87.78571856568684, 1.07206093361989)

(-81.84058632300203, -0.908487796295731)

(-5.871915280011989, 1.64672316794882)

(87.8035463465879, -0.910336890591339)

(66.34277865157937, 0.888981880025799)

(-72.19355320534488, 1.18694010507801)

(-77.72571703876044, 0.522882705493363)

(-83.94400587126786, 0.479894133412259)

(64.2499148858234, 0.23835944207481)

(16.24562159821051, -1.26177664427882)

(-61.85842221142619, 0.0768306534387587)

(-39.79141160377455, -1.61705157908055)

(18.24791030024052, -1.3157447333335)

(69.32986163123788, -0.536800429133705)

(93.75591471441857, -1.22225947668199)

(-53.87785575845691, -0.296383649424088)

(8.121402378252785, 2.21432331894488)

(29.23222607275975, -1.56793247208485)

(1.757487679566813, 2.23122856178744)

(79.76040980821381, 0.310694553304226)

(-3.9740094836175293, 1.98596791565122)

(27.286395381120506, 2.08484221611745)

(82.20444675995824, 1.74950019091033)

(60.88581395497595, -1.68041413795555)

(-15.3508947858058, 0.900005123632314)

(11.069120680726392, 0.252697808719373)

(-15.754920694173173, 1.29643756401958)

(47.26163240206123, 1.1126376460065)

(46.18587456642046, 2.05636542658033)

(-33.8628507747295, 0.609804928108061)

(-46.92831663069898, 1.05561656898399)

(-1.7894823629334766, 0.271977728650254)

(-65.58084618952749, 0.867383727832319)

(-51.15604101923061, 0.472557911280981)

(36.79721266610471, 0.465458455391031)

(-91.92867092173525, -0.0171549645821363)

(22.138446115202626, -0.89651589398298)

(6.13338537866179, -0.895986177863084)

(-87.15718560527543, -0.0274940903763204)

(3.9523018708453495, 0.521418115405953)

(85.42783457221287, 0.68136376085504)

(57.54332214170678, 0.0885819277160163)

(-89.74988789950542, -1.72708282333138)

(48.183315501735876, 0.377912527419599)

(78.44981619247996, 1.33985854897891)

(-72.10646779521804, 1.10037696142293)

(9.710674510111312, -1.03079681074621)

(-11.621672446496989, 2.06000225359449)

(-40.145318460267575, 0.609272386516736)

(-17.98793876478641, 2.00873282272673)

(-89.88979015849739, -1.6878531739228)

(-14.068329416217198, 0.252365378903732)

(-22.067384423423757, 1.32590679062373)

(99.63648751480619, -1.52987714544096)

(44.76972449989114, -0.0414287677900198)

(80.36860648574562, -1.71690252331832)

(94.1405234555763, 1.14293543038608)

(31.257816820740402, 1.09242344557681)

(-49.27926056709511, 2.08393133091633)

(-55.85333142489263, 1.89062010610832)

(57.73415852338577, 2.17667833321499)

(-95.86009977187342, 0.25086196722793)


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:
$$x_{1} = 56.2735892190937$$
$$x_{2} = -99.1940994186411$$
$$x_{3} = 42.2424741036786$$
$$x_{4} = -43.8482155265515$$
$$x_{5} = 90.6554540354125$$
$$x_{6} = -0.730978270667906$$
$$x_{7} = 28.2485792398582$$
$$x_{8} = -74.0622869224726$$
$$x_{9} = -81.840586323002$$
$$x_{10} = 87.8035463465879$$
$$x_{11} = 64.2499148858234$$
$$x_{12} = 16.2456215982105$$
$$x_{13} = -61.8584222114262$$
$$x_{14} = -39.7914116037745$$
$$x_{15} = 18.2479103002405$$
$$x_{16} = 69.3298616312379$$
$$x_{17} = 93.7559147144186$$
$$x_{18} = -53.8778557584569$$
$$x_{19} = 29.2322260727598$$
$$x_{20} = 60.885813954976$$
$$x_{21} = -91.9286709217352$$
$$x_{22} = 22.1384461152026$$
$$x_{23} = 6.13338537866179$$
$$x_{24} = -87.1571856052754$$
$$x_{25} = 57.5433221417068$$
$$x_{26} = -89.7498878995054$$
$$x_{27} = 9.71067451011131$$
$$x_{28} = -89.8897901584974$$
$$x_{29} = 99.6364875148062$$
$$x_{30} = 44.7697244998911$$
$$x_{31} = 80.3686064857456$$
Puntos máximos de la función:
$$x_{31} = 22.349323885059$$
$$x_{31} = -47.4608457084011$$
$$x_{31} = -22.4903520904245$$
$$x_{31} = 6.3967526067572$$
$$x_{31} = 96.0892263352259$$
$$x_{31} = 52.2497863224473$$
$$x_{31} = -7.72541014397883$$
$$x_{31} = -19.816274863823$$
$$x_{31} = -9.87092112794122$$
$$x_{31} = 14.7224702337865$$
$$x_{31} = -41.8314912305025$$
$$x_{31} = 98.0953333197619$$
$$x_{31} = 87.7857185656868$$
$$x_{31} = -5.87191528001199$$
$$x_{31} = 66.3427786515794$$
$$x_{31} = -72.1935532053449$$
$$x_{31} = -77.7257170387604$$
$$x_{31} = -83.9440058712679$$
$$x_{31} = 8.12140237825279$$
$$x_{31} = 1.75748767956681$$
$$x_{31} = 79.7604098082138$$
$$x_{31} = -3.97400948361753$$
$$x_{31} = 27.2863953811205$$
$$x_{31} = 82.2044467599582$$
$$x_{31} = -15.3508947858058$$
$$x_{31} = 11.0691206807264$$
$$x_{31} = -15.7549206941732$$
$$x_{31} = 47.2616324020612$$
$$x_{31} = 46.1858745664205$$
$$x_{31} = -33.8628507747295$$
$$x_{31} = -46.928316630699$$
$$x_{31} = -1.78948236293348$$
$$x_{31} = -65.5808461895275$$
$$x_{31} = -51.1560410192306$$
$$x_{31} = 36.7972126661047$$
$$x_{31} = 3.95230187084535$$
$$x_{31} = 85.4278345722129$$
$$x_{31} = 48.1833155017359$$
$$x_{31} = 78.44981619248$$
$$x_{31} = -72.106467795218$$
$$x_{31} = -11.621672446497$$
$$x_{31} = -40.1453184602676$$
$$x_{31} = -17.9879387647864$$
$$x_{31} = -14.0683294162172$$
$$x_{31} = -22.0673844234238$$
$$x_{31} = 94.1405234555763$$
$$x_{31} = 31.2578168207404$$
$$x_{31} = -49.2792605670951$$
$$x_{31} = -55.8533314248926$$
$$x_{31} = 57.7341585233858$$
$$x_{31} = -95.8600997718734$$
Decrece en los intervalos
$$\left[99.6364875148062, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -99.1940994186411\right]$$
Asíntotas horizontales
Hallemos las asíntotas horizontales mediante los límites de esta función con x->+oo y x->-oo
$$\lim_{x \to -\infty}\left(\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4}\right) = \left\langle - \frac{7}{4}, \frac{9}{4}\right\rangle$$
Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la izquierda:
$$y = \left\langle - \frac{7}{4}, \frac{9}{4}\right\rangle$$
$$\lim_{x \to \infty}\left(\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4}\right) = \left\langle - \frac{7}{4}, \frac{9}{4}\right\rangle$$
Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la derecha:
$$y = \left\langle - \frac{7}{4}, \frac{9}{4}\right\rangle$$
Asíntotas inclinadas
Se puede hallar la asíntota inclinada calculando el límite de la función sin(x) - cos(x^2) + 1/4, dividida por x con x->+oo y x ->-oo
$$\lim_{x \to -\infty}\left(\frac{\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4}}{x}\right) = 0$$
Tomamos como el límite
es decir,
la inclinada coincide con la asíntota horizontal a la derecha
$$\lim_{x \to \infty}\left(\frac{\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4}}{x}\right) = 0$$
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:
$$\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4} = - \sin{\left(x \right)} - \cos{\left(x^{2} \right)} + \frac{1}{4}$$
- No
$$\left(\sin{\left(x \right)} - \cos{\left(x^{2} \right)}\right) + \frac{1}{4} = \sin{\left(x \right)} + \cos{\left(x^{2} \right)} - \frac{1}{4}$$
- No
es decir, función
no es
par ni impar