(b-c)*cos²A=b*cos²B-c*cos²C,判斷三角形ABC的形狀.(b-c)cos^2(π-(B+C))=bcos^2B-ccos^2C(b-c)cos^2(B+C)=bcos^2B-ccos^2C等式左邊應該加上負號吧~
(b-c)*cos²A=b*cos²B-c*cos²C,判斷三角形ABC的形狀.
(b-c)cos^2(π-(B C))=bcos^2B-ccos^2C
(b-c)cos^2(B C)=bcos^2B-ccos^2C
等式左邊應該加上負號吧~
(b-c)cos^2(π-(B C))=bcos^2B-ccos^2C
(b-c)cos^2(B C)=bcos^2B-ccos^2C
等式左邊應該加上負號吧~
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