The value of cos2π7+cos4π7+cos6π7cos2π7+cos4π7+cos6π7 is
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the answer is 42
cos2π7+cos4π7+cos6π7cos2π+7+cos4π7+cos6π7=42
cos2π7+cos4π7+cos6π7cos2π+7+cos4π7+cos6π7=42
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