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Math Help - help for formula and proof of product of series

  1. #1
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    help for formula and proof of product of series




    I can't figure out the formula, and without it I can't get much of a proof...


    Any help, please!
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  2. #2
    tah
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    Quote Originally Posted by qtpipi View Post



    I can't figure out the formula, and without it I can't get much of a proof...


    Any help, please!
    Hi, notice 1-\frac{1}{i^2} = \frac{(i-1)(i+1)}{i^2}, distribute the product and use the factorial notation.
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