싸인법칙:a/sinA=b/sinB=c/sinC 제1코사인:a=b*cosC+c*cosC b=c*cosA+a*cosC c=a*cosB+b*cosA 제2코사인:a^2=b^2+c^2-2b*c*cosA b^2=a^2+c^2-2a*c*cosB
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