Results 1 to 4 of 4

Math Help - Calculus Derivative problems

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    2

    Calculus Derivative problems

    Hi
    If you could, please help me solve any these problems (I believe a keyword is Derivative):


    1] f ( x) =e^x cos x (0 <= x <= 2 pi)
    sketch the graph of the function over the specified interval by obtaining the following info.

    a) the intervals where f is increasing and where it is decreasing
    b) the relative extrema of f
    c) the concavity of f
    d)the inflection points of f

    2] find an equation of the tangent line to the graph of the function
    f (x ) = e^secx at the point (pi/4, e^ squared root of 2)

    3] determine the intervals where the function f (X ) e^x cos x (0 <= x <= 2 pi)

    ty
    Last edited by sahcnam; September 11th 2008 at 07:55 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member 11rdc11's Avatar
    Joined
    Jul 2007
    From
    New Orleans
    Posts
    894
    She doesn't know how take a derivative? Use product rule

    (du)(v)+(dv)(u)

    f'(x) = e^xcos(x)~-~sin(x)e^x
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2008
    Posts
    2

    ty

    thanks for the help.
    Last edited by sahcnam; September 11th 2008 at 07:56 PM.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member 11rdc11's Avatar
    Joined
    Jul 2007
    From
    New Orleans
    Posts
    894
    B) set the 1st derivative to 0 and test the critical points between 0 \leq{x} \leq2 \pi
    C) use 2nd derivative test
    D) set 2nd derivative to 0 and test
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. A few basic calculus derivative problems
    Posted in the Calculus Forum
    Replies: 8
    Last Post: October 3rd 2010, 03:34 PM
  2. Replies: 2
    Last Post: June 25th 2010, 11:41 PM
  3. Replies: 3
    Last Post: May 31st 2010, 12:09 AM
  4. Pre-calculus Problems
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: January 16th 2007, 05:33 PM
  5. Help!! Calculus Problems!
    Posted in the Calculus Forum
    Replies: 15
    Last Post: March 26th 2006, 10:59 AM

Search Tags


/mathhelpforum @mathhelpforum