e.parcial 2 calculo

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    INSTITUTO POLITCNICO NACIONALEscuela Superior de Cmputo

    Examen 2 Parcial

    Alumno!

    Yosef Israel Gutirrez Moreno

    "rupo!1CV9

    Pro#esor!

    Alfredo Guzmn Rangel

    $ateria!

    Calculo

    Semestre!

    1!"

    SE"UN%O E&A$EN PA'CIAL %E C(LCULO

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    "

    1#$%aluar el l&mite' si es (ue e)iste#

    limt 0( 1

    t1+ t

    1

    t) limx x2+axx2+ax

    "#*etermine las as&ntotas +,orizontales o%erticales- seg.n sea el caso de la funci/n

    f(x )= 5x

    x2+4 0 graf&carla#

    # 23ara (u %alores de la constante la funci/n f

    es continua so4re el inter%alo ( , ) 5

    f(x )={ax

    2

    +2x si x

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    1#

    limt 0(

    1

    t1+ t

    1

    t)

    limt 0( tt1+ ttt(1+ t))

    limt0( tt1+ tt21+t) [ t+t1+tt+t1+t]

    t+t1+t

    t

    2

    t2

    (1+t)t2

    1+t()

    limt 0

    t+t1+tt2t2t3

    t2

    1+t()

    limt 0

    limt 0( t

    3

    t3

    1+t+t3 (1+t))

    limt 0( t

    3

    t3 (1+ t+(1+t)) )

    limt 0(

    1

    1+t+(1+t))

    1

    (1+1 )=11+1

    =12

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    "#

    As&ntotas %erticales 6ara

    f(x )= 5x

    x2+4

    x2+4=0

    (x2+4)2

    =02

    x2+4=0

    x2=4

    Como no a0 negati%as' no e)isten as&ntotas%erticales#

    As&ntotas orizontales

    limx

    5x

    x2+4

    limx

    5x

    x

    limx

    x2

    x2+4

    x2

    =lim

    x

    5

    limx 1+

    4

    x2

    = 5

    1+0=

    5

    1=5

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    8#

    {c x2+2x Si x

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    ;

    # f(x )={x2+1 si x1

    *iscontinuidad remo%i4le en )

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    =8# f( t)=

    1

    t

    ( t+h)th

    =

    f'(x )= lim

    h 0

    1

    ( t+h )1

    t

    h =

    limh 0

    tt+h

    tt+hh

    =

    limh 0

    t+h

    t

    [ tt+h

    h (tt+h)t+t+h

    t+t+h ]=h

    tt+h

    limh0

    [ t( t+h )

    h (tt+h )1

    t+t+h]=

    limh0

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    >

    [ h

    h (tt+h )1

    t+t+h]=limh0

    [ 1(tt+h ) (t+t+h ) ]=lim

    h0

    [ 1(tt) (t+t)]=[ 1

    t(t+t)]=1

    t3

    2+ t3

    2

    =1

    2t3

    lim

    x

    4

    1tanxcosxsenx

    1sen x

    cosx

    cosxsenx=

    lim

    x

    4

    lim

    x 4

    cosxsenx

    cosx(cosxsenx)

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    9

    lim

    x

    4

    1

    cosx=

    1

    cos4

    = 1

    22

    = 2

    2