在三角形ABC中角B等于30度AB等于6AC等于5则BC的长是

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AC/sinB=AB/sinC
simC=AB*sinB/AC=3/虚让弊5
cosC=±4/5
AB^2=AC^2+BC^2-2AC*BC*cosC
36=25+BC^2±8BC
BC>差族0
BC=4+3√3或滑亮
BC=3√3-4

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运用公式:BC/sinA=AC/sinB=AB/sinC

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这道题有毛病吧

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