Results 1 to 3 of 3

Thread: Calculus Help Needed!

  1. January 6th 2007, 01:33 PM #1
    asnxbbyx113
    asnxbbyx113 is offline
    Newbie
    Joined
    Jan 2007
    Posts
    19

    Calculus Help Needed!

    Find y'(x) and y''(x) for y=x*sin(4x)
    Follow Math Help Forum on Facebook and Google+
  2. January 6th 2007, 01:45 PM #2
    topsquark
    topsquark is offline
    Moderator
    topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,079
    Thanks
    153
    Awards
    1
    MHF Donor
    Quote Originally Posted by asnxbbyx113 View Post
    Find y'(x) and y''(x) for y=x*sin(4x)
    Use the chain rule:
    y' = 1 \cdot sin(4x) + x \cdot cos(4x) \cdot 4 = 4xcos(4x) + sin(4x)

    y'' = 4 (1 \cdot cos(4x) + x \cdot -sin(4x) \cdot 4) + cos(4x) \cdot 4 = 8 cos(4x) - 16xsin(4x)

    -Dan
    Follow Math Help Forum on Facebook and Google+
  3. January 6th 2007, 03:27 PM #3
    asnxbbyx113
    asnxbbyx113 is offline
    Newbie
    Joined
    Jan 2007
    Posts
    19
    Thank You So Much!
    Follow Math Help Forum on Facebook and Google+
« sketch quadric surfaces | Related rates: urgent »

Similar Math Help Forum Discussions

  1. What pre-calculus needed for this calculus class?
    Posted in the Calculus Forum
    Replies: 1
    Last Post: December 13th 2011, 09:11 PM
  2. Calculus 3 Help needed-Minimizing
    Posted in the Calculus Forum
    Replies: 4
    Last Post: July 23rd 2009, 11:09 AM
  3. Calculus help needed
    Posted in the Calculus Forum
    Replies: 2
    Last Post: November 18th 2007, 03:44 PM
  4. Calculus Help Needed!
    Posted in the Calculus Forum
    Replies: 6
    Last Post: January 21st 2007, 07:58 AM
  5. Help In Calculus Needed
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 18th 2006, 10:39 PM

Search Tags


/mathhelpforum @mathhelpforum