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Sine/cosine function and polynomial function

  1. Jul 31, 2015 #1
    Some values of sine and cosine can ben expressed how the root of a polynomial of nth degree.

    Example:http://www.wolframalpha.com/input/?i=cos((180/7)°)

    (Roll the scroll still you find: "alternate forns" and see the associated polynomial: " x³ - 4 x² - 4 x + 1")

    So, where I can find the mathematical relationship between the coefficients of a polynomial of nth degree with the argument of the function sine and cosine?

    PS: ANY information is welcome!
     
  2. jcsd
  3. Jul 31, 2015 #2
    Im not sure that every polynomial is related to a trig function just because some trig functions are related to polynomials.
     
  4. Aug 1, 2015 #3
    I wrote some.

    More tips?
     
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