【大学入試数学 一橋大2022年の問題】原点と他の２点で作る三角形の面積公式を使います。
Synopsis
三角形の面積公式#余弦定理 座標平面上の原点を含む３点で作る三角形の最大面積を求めます。面積公式には絶対値が含まれる ...
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