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