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 derivadax3sin(x)−x43(1−cos(x))=0Resolvermos esta ecuaciónRaíces de esta ecuación
x1=69.1150383789755x2=34.3834574736429x3=−358.141562509236x4=53.2946120595863x5=12.5663706143592x6=−31.4159265358979x7=−34.3834574736429x8=−100.530964914873x9=−69.1150383789755x10=172.752867742679x11=−25.1327412287183x12=28.0613255359845x13=−103.614666881545x14=−81.6814089933346x15=97.3277443984361x16=−46.9963934217376x17=18.8495559215388x18=94.2477796076938x19=21.7165998839246x20=8.76525105319464x21=−91.0403059179293x22=−62.8318530717959x23=−97.3277443984361x24=−59.5896567409223x25=−84.7522366006475x26=78.4633847807352x27=40.6935271463195x28=−56.5486677646163x29=−40.6935271463195x30=72.1735459082524x31=−18.8495559215388x32=6.28318530717959x33=56.5486677646163x34=87.9645943005142x35=31.4159265358979x36=25.1327412287183x37=43.9822971502571x38=−12.5663706143592x39=−15.3212429040887x40=−50.2654824574367x41=−8.76525105319464x42=65.8824372805376x43=100.530964914873x44=59.5896567409223x45=81.6814089933346x46=191.605840141864x47=−75.398223686155x48=−65.8824372805376x49=103.614666881545x50=91.0403059179293x51=−87.9645943005142x52=37.6991118430775x53=−78.4633847807352x54=−6.28318530717959x55=−53.2946120595863x56=84.7522366006475x57=50.2654824574367x58=−37.6991118430775x59=15.3212429040887x60=−28.0613255359845x61=46.9963934217376x62=62.8318530717959x63=−72.1735459082524x64=−94.2477796076938x65=75.398223686155x66=−43.9822971502571x67=−21.7165998839246Signos de extremos en los puntos:
(69.11503837897546, 0)
(34.38345747364294, 4.88301086492743e-5)
(-358.14156250923645, 0)
(53.294612059586285, 1.3170617075317e-5)
(12.566370614359172, 0)
(-31.41592653589793, 0)
(-34.38345747364294, -4.88301086492743e-5)
(-100.53096491487338, 0)
(-69.11503837897546, 0)
(172.75286774267903, 3.87813789774886e-7)
(-25.132741228718345, 0)
(28.06132553598445, 8.9489039255268e-5)
(-103.61466688154489, -1.79639721612586e-6)
(-81.68140899333463, 0)
(97.3277443984361, 2.16724291945259e-6)
(-46.99639342173757, -1.91897937474958e-5)
(18.84955592153876, 0)
(94.2477796076938, 0)
(21.716599883924637, 0.000191621714203828)
(8.76525105319464, 0.00265844950588122)
(-91.04030591792932, -2.64763151549218e-6)
(-62.83185307179586, 0)
(-97.3277443984361, -2.16724291945259e-6)
(-59.58965674092231, -9.42796575308398e-6)
(-84.75223660064755, -3.28119978897628e-6)
(78.46338478073515, 4.13422835053337e-6)
(40.69352714631952, 2.95188908411357e-5)
(-56.548667764616276, 0)
(-40.69352714631952, -2.95188908411357e-5)
(72.17354590825245, 5.31063132429645e-6)
(-18.84955592153876, 0)
(6.283185307179586, 0)
(56.548667764616276, 0)
(87.96459430051421, 0)
(31.41592653589793, 0)
(25.132741228718345, 0)
(43.982297150257104, 0)
(-12.566370614359172, 0)
(-15.32124290408871, -0.000535560240964847)
(-50.26548245743669, 0)
(-8.76525105319464, -0.00265844950588122)
(65.88243728053762, 6.97945398544749e-6)
(100.53096491487338, 0)
(59.58965674092231, 9.42796575308398e-6)
(81.68140899333463, 0)
(191.60584014186395, 2.84247933754335e-7)
(-75.39822368615503, 0)
(-65.88243728053762, -6.97945398544749e-6)
(103.61466688154489, 1.79639721612586e-6)
(91.04030591792932, 2.64763151549218e-6)
(-87.96459430051421, 0)
(37.69911184307752, 0)
(-78.46338478073515, -4.13422835053337e-6)
(-6.283185307179586, 0)
(-53.294612059586285, -1.3170617075317e-5)
(84.75223660064755, 3.28119978897628e-6)
(50.26548245743669, 0)
(-37.69911184307752, 0)
(15.32124290408871, 0.000535560240964847)
(-28.06132553598445, -8.9489039255268e-5)
(46.99639342173757, 1.91897937474958e-5)
(62.83185307179586, 0)
(-72.17354590825245, -5.31063132429645e-6)
(-94.2477796076938, 0)
(75.39822368615503, 0)
(-43.982297150257104, 0)
(-21.716599883924637, -0.000191621714203828)
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=69.1150383789755x2=12.5663706143592x3=−34.3834574736429x4=−103.614666881545x5=−46.9963934217376x6=18.8495559215388x7=94.2477796076938x8=−91.0403059179293x9=−97.3277443984361x10=−59.5896567409223x11=−84.7522366006475x12=−40.6935271463195x13=6.28318530717959x14=56.5486677646163x15=87.9645943005142x16=31.4159265358979x17=25.1327412287183x18=43.9822971502571x19=−15.3212429040887x20=−8.76525105319464x21=100.530964914873x22=81.6814089933346x23=−65.8824372805376x24=37.6991118430775x25=−78.4633847807352x26=−53.2946120595863x27=50.2654824574367x28=−28.0613255359845x29=62.8318530717959x30=−72.1735459082524x31=75.398223686155x32=−21.7165998839246Puntos máximos de la función:
x32=34.3834574736429x32=−358.141562509236x32=53.2946120595863x32=−31.4159265358979x32=−100.530964914873x32=−69.1150383789755x32=172.752867742679x32=−25.1327412287183x32=28.0613255359845x32=−81.6814089933346x32=97.3277443984361x32=21.7165998839246x32=8.76525105319464x32=−62.8318530717959x32=78.4633847807352x32=40.6935271463195x32=−56.5486677646163x32=72.1735459082524x32=−18.8495559215388x32=−12.5663706143592x32=−50.2654824574367x32=65.8824372805376x32=59.5896567409223x32=191.605840141864x32=−75.398223686155x32=103.614666881545x32=91.0403059179293x32=−87.9645943005142x32=−6.28318530717959x32=84.7522366006475x32=−37.6991118430775x32=15.3212429040887x32=46.9963934217376x32=−94.2477796076938x32=−43.9822971502571Decrece en los intervalos
[100.530964914873,∞)Crece en los intervalos
(−∞,−103.614666881545]