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2Â¥: Originally posted by Edstrayer at 2016-04-13 14:23:25
|\sin kx|\leqslant 1\Rightarrow\frac{1}{n}\sum\limits_{k=1}^n|\sin kx|\leqslant 1
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\limsup\limits_{n\to+\infty}\frac{1}{n}\sum\limits_{k=1}^n|\sin kx|\leqslant 1
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