cÁlculo i - ad1 - ad2 - ad3 - afonso celso

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  • 8/3/2019 CLCULO I - AD1 - AD2 - AD3 - AFONSO CELSO

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    CURSOS LIVRES DE 3 GRAU CLCULO I

    ATIVIDADE 01

    1) Resolva as seguintes inequaes:

    (a) 01

    1

    < < + < <

    > > + > >

    = < >

    2) Faa o grfico das seguintes funes:

    3 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    Obs.: Voc pode usar o Software Graph (acesse o site para download do programa no link:

    http://www.padowan.dk/graph) para construir os grficos.

    (a) 32 += xy

    (b) ( ) 322 += xxxf

    (c) ( ) 123 = xxxg

    (d) ( ) )1cos( = xxh

    Soluo:

    a) y = 2x + 3

    f(x)=2*x+3

    -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9

    -8

    -6

    -4

    -2

    2

    4

    6

    8

    x

    y

    b) ( ) 322 += xxxf

    4 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

    http://www.padowan.dk/graphhttp://www.padowan.dk/graph
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    f(x)=-x^ 2+2*x-3

    -9 -8 -7 -6 -5 -4 -3 -2 - 1 1 2 3 4 5 6 7 8 9

    -8

    -6

    -4

    -2

    2

    4

    6

    8

    x

    y

    c) ( ) 123 = xxxg

    f(x)=x^ 3-2*x-1

    -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9

    -8

    -6

    -4

    -2

    2

    4

    6

    8

    x

    y

    d) ( ) )1cos( = xxh

    5 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    f(x)=cos(x-1)

    -3 -5/2 -2 -3/2 - -/2 /2 3/2 2 5/2 3

    -8

    -6

    -4

    -2

    2

    4

    6

    8

    x

    y

    3) Para as funes dadas, determine o domnio; o conjunto imagem; analise o sinal; identifique intervalos de

    crescimento e decrescimento.

    (a) 122 += xxy

    (b)

    x

    y

    = 31

    Soluo:

    a) 122 += xxy

    Traando o grfico via o Software Graph:

    6 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    f(x)=-x^ 2+2*x-1

    -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9

    -8

    -6

    -4

    -2

    2

    4

    6

    8

    x

    y

    A partir desse grfico, tiramos algumas concluses:

    1) Domnio

    D = .

    2) Conjunto-Imagem

    { }Im y | y 0=

    3) Variao de Sinal

    Se x 1 y 0

    Se x 1 y 0

    = =

    4) Intervalos de Crescimento e de Decrescimento da Funo:

    A funo decrescente em , +

    4) Um estacionamento oferece as seguintes opes de cobrana: (1,0 ponto)

    00,5$R por dia;

    00,1$R por dia adicionando uma taxa fixa de 00,40$R .

    Determine:

    a) As funes para o custo Cde estacionamento, porxdias, com os dois tipos de pagamento.

    b) Esboce os grficos das duas funes no mesmo sistema de eixo cartesiano.

    Soluo:

    a) Funo Custo

    Tipo 1: ( )C x 5x=

    Tipo 2: ( )C x x 40= +

    b) Grficos

    9 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    (f)15234

    592lim

    2

    2

    5 +

    xx

    xx

    x

    Soluo:

    (a)2

    2x 2

    x 5x 6lim

    x x 2+ +

    =+

    ( ) ( )

    ( ) ( )

    22

    2 2x 2

    2

    2x 2

    2 5 2 6x 5x 6lim

    x x 2 2 2 2

    x 5x 6 4 10 6 10 10 0lim

    x x 2 4 2 2 4 4 0

    + ++ +=

    + +

    + + + = = =

    +

    Levantando a indeterminao00

    ;

    ( ) ( )( ) ( )

    2

    2x 2 x 2x 2 N xx 5x 6lim lim

    x x 2 x 2 D x + + =

    +

    Aplicando o Dispositivo de Briot-Ruffini:

    1 5 6 -2

    1 3 0

    Assim: N(x) = x + 3

    1 1 -2 -2

    1 -1 0

    Assim: D(x) = x 1

    Substituindo:

    11 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    ( ) ( )

    ( ) ( )

    ( )

    2

    2x 2 x 2

    2

    2x 2 x 2

    x 2 N xx 5x 6lim lim

    x x 2 x 2 D x

    x 2x 5x 6lim lim

    x x 2

    + +=

    +

    + +=

    +

    ( )

    ( )

    x 3

    x 2

    +

    ( )

    ( )

    ( )

    2

    2x 2 x 2

    2

    2x 2

    x 1

    x 3x 5x 6 2 3 1lim lim

    x x 2 x 1 2 1 3

    x 5x 6 1lim

    x x 2 3

    ++ + += = =

    +

    + +=

    +

    (b)xx

    xx

    x 6

    3lim

    2

    2

    ++

    2

    2

    2x x

    3x

    x3x xlim lim

    x 6x

    +

    =+

    0

    2

    1

    6x 1

    x

    +

    +

    ( )

    0

    2 2

    2 2x x x

    2

    2x

    3x x xlim lim lim 1 1x 6x x3x x

    lim 1x 6x

    + = = = + +

    = +

    (c)36

    6lim

    36 +

    x

    x

    x

    12 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    ( )( )

    ( )( )

    ( )( ) ( )

    ( ) ( )

    ( )

    x 36

    22

    x 36 x 36

    x 36 x 36 x 36

    x 6 36 6 0lim

    x 36 36 36 0

    Assim:

    x 6 x 6 x 6lim lim

    x 36 x 6 x 36 x 6

    x 36x 6 x 36lim lim lim

    x 36 x 36 x 6

    = =

    + +

    + =

    + + + +

    = =

    + + + ( )x 36 ( )

    x 36 x 36

    x 36

    x 6

    x 6 1 1 1 1lim limx 36 6 6 12x 6 36 6

    x 6 1lim

    x 36 12

    +

    = = = = + ++ +

    =

    +

    (d)x 2

    xlim

    2 x+= +

    x 2+ ( )

    xf x

    2 x=

    -1,7 5,6667

    -1,8 9,0000

    -1,9 19,000

    -1,99 190,00

    -1,999 1.999

    -1,9999 19.999

    -1,99999 199.999

    -1,999999 1.999.999

    etc etc

    ( )x 2x 2x x 2 2 2

    lim lim 12 x 2 x 2 2

    2porque 0

    + +

    + + = = = = = +

    +

    +

    13 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    (e)0

    1 coslimx

    x

    x

    ( )

    ( ) ( )

    ( ) ( )

    ( )

    x 0

    2

    x 0x 0

    2

    x 0 x 0x 0

    x 0x 0

    1 01 x 1 1 0

    x 0 0 0

    Assim

    1 x 1 x 1 x

    x 1 x x 1 x

    1 x sen x senx senx

    x x 1 x x 1 x

    1 x senx

    x x

    = = =

    + =

    + +

    = = + +

    =

    coscos

    :

    cos cos coslim

    cos cos

    coslim limcos cos

    coslim

    lim

    lim

    lim

    lim( )

    ( )

    1

    x 0

    x 0

    sen 0senx 0 00

    1 x 1 0 1 1 2

    1 x0

    x

    = = = =+ + +

    =

    limcos cos

    coslim

    (f) 15234

    592lim 2

    2

    5 +

    xx

    xx

    x

    ( ) ( )

    ( ) ( )

    22

    22x 5

    2 5 9 5 52x 9x 5 50 50 0

    4x 23x 15 115 115 04 5 23 5 15

    = = =

    + +lim

    Levantando a indeterminao00

    :

    ( ) ( )( ) ( )

    2

    2x 5 x 2

    x 5 N x2x 9x 5lim lim4x 23x 15 x 5 D x = +

    Aplicando o Dispositivo de Briot-Ruffini:

    2 -9 -5 5

    2 1 0

    14 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    Assim: N(x) = 2x +1

    4 -23 15 5

    4 -3 0

    Assim: D(x) = 4x 3

    Substituindo:

    ( ) ( )

    ( ) ( )

    ( )

    2

    2x 5 x 5

    2

    2x 5 x 5

    x 5 N x2x 9x 5lim lim

    4x 23x 15 x 5 D x

    x 52x 9x 5lim lim

    4x 23x 15

    =

    +

    =

    +

    ( )

    ( )

    2x 1

    x 5

    +

    ( )

    ( )

    ( )

    2

    2x 5 x 5

    2

    2x 5

    4x 3

    2x 12x 9x 5 2 5 1 10 1 11lim lim

    4x 23x 15 4x 3 4 5 3 20 3 17

    2x 9x 5 11lim

    4x 23x 15 17

    + + += = = =

    +

    =

    +

    6) Seja a funo, representada graficamente da seguinte forma:

    15 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    (a) Determine ( )1f ( )4f ( )3f

    (b) Analise o sinal da funo ( )xf

    (c) )(lim3

    xfx

    +

    (d) )(lim3 xfx Soluo:

    (a) Determine ( )1f ( )4f ( )3f

    Observando o grfico, temos que:

    f(-1) = - 1 f(4) = 3 f(3) = 1

    (b) Analise o sinal da funo ( )xf

    16 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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    ( )f x 0 x 3

    f x 0 x 3

    < ( )

    ( )

    ( )

    f x 0 x 3

    f x 1 x 3

    f x 0 x 3

    < > ( )

    (c) )(lim3

    xfx

    +

    x 3f x 3

    +=( )lim

    (d) )(lim3

    xfx

    x 3 f x 1 = ( )lim

    7) Considere a funo:

    17 AFONSO CELSO FONE: (62) 3092-2268 / CEL: (62) 9216-9668

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