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Math Help - Limit of Sequence

  1. #1
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    Limit of Sequence

    find the limit of the sequence :


    <br />
\lim_{x\to \infty}(cos\frac{x}{2}cos\frac{x}{4}...cos\frac{x}  {2^n})
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  2. #2
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    In this question do you mean
    \displaystyle \lim_{n\to \infty}\text{ or }\lim_{x\to \infty}~?
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  3. #3
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    sorry
    it's  \lim_{n\to \infty}
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  4. #4
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    I believe what you ask about is know as Vičte's infinite product

    see List of trigonometric identities - Wikipedia, the free encyclopedia

    a little more than half way down.
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