코싸인 1법칙 a=bcosC+ccosA, b=ccosA+acosS, c=acosB+bcosA, 코싸인2법칙 a제곱=b제곱+c제곱-2bccosA, b제곱=c제곱+a제곱-2cacosB, c제곱=a제곱+b제곱-2abcosC
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