Compute the product from n = 2 to infinity of [1 - 1/n^2]
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sin(pi z)/(pi z) = Product from n = 1 to infinity of [1 - z^2/n^2] (1)
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Solution Summary
This solution we compute the product using both the infinite product representation of sin(pi z) and using elementary, high school level, and methods.
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We have:
sin(pi z)/(pi z) = Product from n = 1 to infinity of [1 - z^2/n^2] (1)
To compute the product from n = 2 to infinity of (1 - 1/n^2), we need to take out the factor for n = 1 in the product in (1), because this is zero at z = 1:
sin(pi z)/(pi z) = Product from n = 1 to infinity of [1 - z^2/n^2] =
(1 - z^2) Product from n = 2 to infinity of [1 - z^2/n^2] ------------>
Product from n = 2 to infinity of [1 - z^2/n^2] = sin(pi z)/[pi z (1 - z^2)]
We can then take the limit of z to 1 on both ...
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