삼각형ABC각A,각B,각C와각각마주보는변을a,b,c a의제곱=b의제곱+c의제곱-2xbxcxcosA b의제곱=a의제곱+c의제곱-2xaxcxcosB c의제곱=a의제곱+b의제곱-2xaxbxcosC
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