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Homework Help: Sin equation formula

  1. Mar 4, 2014 #1
    1. The problem statement, all variables and given/known data

    Find the amplitude, period, phase shift, and vertical shift
    2. Relevant equations

    y=- [itex]1/2[/itex]sin [3 (x-∏/2)] -2

    3. The attempt at a solution
    amp = -[itex]1/2[/itex], vertical shift is 2 down y-axis.

    I can't get the period and ph. shift.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 5, 2014 #2

    HallsofIvy

    User Avatar
    Science Advisor

    The "standard" sine function, sin(x), has one period starting at [itex]x= 0[/itex] and ending at [itex]x= 2\pi[/itex]. The function sin(a(x- b)) has one period starting at [itex]a(x- b)= 0[/itex], or [itex]x= b[/itex] and ending at [itex]a(x- b)= 2\pi[/itex] or [itex]x= b+ \frac{2\pi}{a}[/itex].
     
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