cos²﹙﹣π/12﹚-sin²π/12

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cos²﹙﹣π/12﹚-sin²π/12
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cos²﹙﹣π/12﹚-sin²π/12
cos²﹙﹣π/12﹚-sin²π/12

cos²﹙﹣π/12﹚-sin²π/12
=cosπ/6
=二分之根号三