Results 1 to 2 of 2

Math Help - Is it true that...? (Derivative Question)

  1. #1
    Junior Member
    Joined
    Oct 2009
    From
    Bloomington, IN
    Posts
    29

    Smile Is it true that...? (Derivative Question)

    Is it true that if y = e^u(cos(u)+cu) where c is a constant, then it's derivative is y' = e^u(-sin(u) + C) + e^u(cos(u) + Cu)? I listed them both below to more easily see them.

    y = e^u(cos(u)+Cu)

    y' = e^u(-sin(u) + C) + e^u(cos(u) + Cu)

    Thanks, I'm just making sure I'm doing the product rule and such correctly!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    29
     y = e^u(\cos(u)+cu)

    I expand and use the product rule.

     y = e^u\cos(u)+e^ucu

    \frac{dy}{du} = e^u\cos(u)- e^u\sin(u)+e^ucu+ce^u

    \frac{dy}{du} = e^u(\cos(u)-\sin(u)+cu+c)

    I agree with your answer.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. true and false question
    Posted in the Business Math Forum
    Replies: 1
    Last Post: October 6th 2010, 08:53 PM
  2. True/False Question
    Posted in the Calculus Forum
    Replies: 3
    Last Post: June 24th 2010, 01:29 PM
  3. derivative true false
    Posted in the Calculus Forum
    Replies: 2
    Last Post: February 15th 2010, 03:33 AM
  4. [SOLVED] True/False about Derivative Graphing
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 26th 2009, 08:50 PM
  5. Need help with Derivative true/false questions
    Posted in the Calculus Forum
    Replies: 3
    Last Post: October 6th 2008, 09:49 PM

Search Tags


/mathhelpforum @mathhelpforum