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If cos2π3−cos(π)+cos4π3−cos5π3+cos(2π)−cos7π3+⋯+cos40π3−cos41π3=k, then the value of |6k| is

Answer» If cos2π3cos(π)+cos4π3cos5π3+cos(2π)cos7π3++cos40π3cos41π3=k, then the value of |6k| is


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