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sinB/sinA+sinA/sinB=((sinA)^2+(sinB)^2)/罩伍(sinAsinB)=6cosC
(sinA)^2+(sinB)^2=6cosCsinAsinB
余弦定理:c^2=a^2+b^2-2abcosC
(sinC)^2=(sinA)^2+(sinB)^2-2sinAsinBcosC
(sinC)^2=4sinAsinBcosC
tanCsinC=4sinAsinB
tanCsin(180-A-B)=4sinAsinB
tanC(sinAcosB+cosAsinB)=4sinAsinB
同时除以sinAsinB
tanC(1/tanB+1/物枝或tanA)=4
之搭乎前的回答,可参考:
http://zhidao.baidu.com/question/178312555.html
(sinA)^2+(sinB)^2=6cosCsinAsinB
余弦定理:c^2=a^2+b^2-2abcosC
(sinC)^2=(sinA)^2+(sinB)^2-2sinAsinBcosC
(sinC)^2=4sinAsinBcosC
tanCsinC=4sinAsinB
tanCsin(180-A-B)=4sinAsinB
tanC(sinAcosB+cosAsinB)=4sinAsinB
同时除以sinAsinB
tanC(1/tanB+1/物枝或tanA)=4
之搭乎前的回答,可参考:
http://zhidao.baidu.com/question/178312555.html
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