Mathematics
Senior High
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ルートの計算が分からなくなってしまいました…わかりやすく教えて欲しいです

余弦定理により cos A = (3+√3)2 + (2√3-√6)2 2 (3+√3) 2√3 6(3+√3) 4√3 (3+√3) √3 2

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