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Homework Help: Need help with sinusoidal functions

  1. Apr 11, 2012 #1
    1. Hello everyone, I am having some trouble determining precise phase shifting by observing the graphs.


    book says this graph has horizontally shifted to the right by 15 units. How was this determined? I can't figure it out!

    second this graph:
    Says the graph was shifted 80 units to the right but again how is this determined? Please help thnx
  2. jcsd
  3. Apr 11, 2012 #2


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    Welcome to PF!

    Hail DoomBringer2! Welcome to PF! :smile:
    Concentrate on the middle of the graph …

    at zero phase shift, it should have that middle value at time 0. :wink:
  4. Apr 11, 2012 #3
    Hint: What does the normal sin function look like without any left or right shifts?
  5. Apr 11, 2012 #4
    thanks a lot guys and gals, I am about to submit my work. hopefully I got it right lol
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