在三角形ABC中,a倍余弦B等于b倍余弦A,则三角形ABC的形状?
人气：316 ℃ 时间：2020-04-08 03:41:57
解答
acosB=bcosA
正弦定理
sinAcosB=cosAsinB
sinAcosB-cosAsinB=0
sin(A-B)=0
A=B 等腰三角形
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