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Math Help - sinusoidal equation

  1. #1
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    sinusoidal equation

    in prince albert,the sun rises at 9:17 on december 21 and 4:35 on june 22. because there is no daylight savings time,the time the sun rises on any other date can be predicted from a sinusoidal graph with a period of 365 days.

    write an equation that relates to the time the sun rises to the day of the year,and remember to show your work
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  2. #2
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    your equation is in the form

    T = Asin (n(d-B)) + C

     n = \frac{365}{2\pi}<br />

    where d = day number and T is time of sunrise

    you can use the points (172,9:17) & (355,4:35)

    do you have any other information?
    Last edited by pickslides; May 31st 2009 at 06:26 PM. Reason: typo
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  3. #3
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    no,thats all they have given me,which is why i am stumped
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  4. #4
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    maybe disregard B to give

    T = Asin (n(d)) + C then sub in points to find A & B.
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