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Homework Help: Phase shift and sinusoidal curve fitting - Finding .

  1. Jun 27, 2011 #1
    Phase shift and sinusoidal curve fitting - Finding.....

    1. The problem statement, all variables and given/known data

    "Find the period, amplitude, and phase shift of each function. Graph each function. Be sure to label key points"

    y = 4sin(2x - pi)

    2. Relevant equations

    3. The attempt at a solution

    So, I got...

    Amplitude = 4
    Period = 2pi/2 = 2

    Phase shift: Would that be pheta/w ?, So pi/2 ?

    Now here is where I get messed up.

    I do not know how to get "Interval defining one cycle" and "Subinterval width"

    How do I generate points from this?
  2. jcsd
  3. Jun 27, 2011 #2


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    Staff: Mentor

    Re: Phase shift and sinusoidal curve fitting - Finding.....

    First step: Graph paper. Sharp pencil. Eraser. Calculator. Plot points in steps of, say 0.1 radian, for x from 0 to 2Pi radians, plotting y vs. x

    Then, complete the plot from 0 back to -Pi radians.

    Do this neatly & well, and you'll discover a lot.
    Last edited: Jun 27, 2011
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