Results 1 to 5 of 5

Math Help - Finding the phase shift?

  1. #1
    Senior Member
    Joined
    Dec 2010
    From
    CPT
    Posts
    304

    Finding the phase shift?

    Can anyone help me find the phase shift for this equation
    y=-4 cos(pi/6)(1)+c)+77
    According to the back of my book the phase shift is .5 but I am not sure how to find that can anyone help me?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Mar 2010
    From
    Florida
    Posts
    3,093
    Thanks
    5
    Quote Originally Posted by homeylova223 View Post
    Can anyone help me find the phase shift for this equation
    y=-4 cos(pi/6)(1)+c)+77
    According to the back of my book the phase shift is .5 but I am not sure how to find that can anyone help me?
    I can't remember what a phase shift is, but if you can remind me, I will give it a go.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    29
    I think the OP requires the horizontal shift which is 'c' in \displastyle y=A\cos b(x-c)+d

    Can the OP please re-post the equation as the brackets are not complete.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member
    Joined
    Dec 2010
    From
    CPT
    Posts
    304
    They do not give me C they want me to find it. However I cannot find it this is what I have done
    y=-4 cos (pi/6(1)-c)+77
    -77=-4cos(pi/6-c)
    19.5=cos(pi/6-c)
    And this is where I am stuck really the problem claim it is a sinusoidal function if that help explain things.
    But they gave me the amplitude, the vertical shift, and the period but they did not give me c or the phase shift so I guess they want me to find it inside the function.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Senior Member
    Joined
    Dec 2010
    From
    CPT
    Posts
    304
    Sorry I mean c=.5 I just dont know how to find c. So I am trying to use the equation to find c.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Phase shift..
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: July 18th 2011, 01:45 AM
  2. phase shift
    Posted in the Trigonometry Forum
    Replies: 6
    Last Post: December 13th 2010, 07:04 PM
  3. phase shift
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: November 15th 2009, 08:58 PM
  4. Finding the Phase Shift of a Function.
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: November 9th 2009, 11:48 PM
  5. Phase shift??
    Posted in the Trigonometry Forum
    Replies: 11
    Last Post: April 23rd 2007, 01:50 PM

Search Tags


/mathhelpforum @mathhelpforum