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Results tagged with trigonometric-sums
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user 169474
12
votes
Trigonometric inequality
I give a way that may work for odd numbers. This is too long for a comment.
First, the quantity
$$\cos\Big(\frac{2m\pi}{p}\Big)+\cos\Big(\frac{2n\pi}{q}\Big)
= 2\cos\Big(\pi\Big(\frac{m}{p}+\frac{n}{ …
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