[情報] 正弦定理的证明
http://tw.youtube.com/watch?v=urYLRpfNt9U
有兩種證明方法
第一種較好理解
不過重要的是
要了解其內涵
不能死背
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誰收了山西布政司的五千兩? (A)何汝大 (B)何夫人 (C)楊秀珍 (D)宋世傑
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