是三角形内的问题吧
sin2A=sin2B
由诱导公式 sin(180°-w)=sinw
所以 sin2A=sin2B,可以得到sin2A=sin(180°-2B)
所以 2A=2B,或2A=180°-2B
即 2A=2B,2A +2B=180°
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