2pi^2/3 -4/1 cos(x)-4/4 cos(2x) -4/9 cos(3x) -4/16 cos(4x) -4/25 cos(5x) - 4/36 cos(6x) - 4/49 cos(7x) - Wolfram|Alpha

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    link to /input/?i=%282+%CF%80%5E2%29%2F3-4+cos%28x%29-cos%282+x%29-4%2F9+cos%283+x%29-1%2F4+cos%284+x%29-4%2F25+cos%285+x%29-1%2F9+cos%286+x%29-4%2F49+cos%287+x%29&lk=1&a=ClashPrefs_*Math-
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