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众所周知,在△ABC中有余弦定理:下面,我们给出它的一种变形:证明:∵a~2=b~2+c~2-2bccosA请下载后查看，本文暂不支持在线获取查看简介。
As we all know, there is a cosine theorem in △ABC: In the following, we give a variant of it: Proof: ∵a~2=b~2+c~2-2bccosA Please download and view, this article does not support online access. .