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京东 11.11 红包
5.11Cosine Rule
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本视频主要讲解的是余弦定理,并且说明了复习了正弦定理可以求解有关已知两条边及夹角求第三条边及角的问题,以及已知两个角和一条边求第三个角及两条边的问题,而余弦定理可以解决有关已知两条边及夹角求其它边和角的问题,或者已知三条边长求三角的问题。
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