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C -> 0 のとき、余弦法則 c^2 = a^2 + b^2 - 2abcos C は何に傾くか。幾何学的に解釈せよ。
C -> 0 のとき、余弦法則 c^2 = a^2 + b^2 - 2abcos C は何に傾くか。幾何学的に解釈せよ。
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