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能的 根據3邊的長度用餘弦定理求出個角的餘弦值 cosA=(b^2+c^2-a^2)/2bc 再根據sinA^2+cos^2=1 求出正弦值 面積等於S=bcsina 就能求出來了 (小寫字母為邊的長度 大寫字母為角)
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