设ΔABC的内角A,B,C所对的边分别为a,b,c,且acosB-bcosA=3/5c(1)求tanA/tanB的值(2)求tan(A-B)的最大值
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![设ΔABC的内角A,B,C所对的边分别为a,b,c,且acosB-bcosA=3/5c(1)求tanA/tanB的值(2)求tan(A-B)的最大值](/uploads/image/z/1836134-62-4.jpg?t=%E8%AE%BE%CE%94ABC%E7%9A%84%E5%86%85%E8%A7%92A%2CB%2CC%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cc%2C%E4%B8%94acosB-bcosA%3D3%2F5c%281%29%E6%B1%82tanA%2FtanB%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82tan%28A-B%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC)
设ΔABC的内角A,B,C所对的边分别为a,b,c,且acosB-bcosA=3/5c(1)求tanA/tanB的值(2)求tan(A-B)的最大值
设ΔABC的内角A,B,C所对的边分别为a,b,c,且acosB-bcosA=3/5c(1)求tanA/tanB的值(2)求tan(A-B)的最大值
设ΔABC的内角A,B,C所对的边分别为a,b,c,且acosB-bcosA=3/5c(1)求tanA/tanB的值(2)求tan(A-B)的最大值
1)acosB-bcosA=3/5c ,所以 (a/c) * cosB - (b/c) * cosA = 3 / 5 .
From Law of Sine (正弦定理) we get (sinA / SinC) * cosB - (sinB/ SinC) * cosA = 3 / 5.
Simplifying this equation we get sin(A - B) / sin(C) = 3 / 5 and further we get sin(A - B) / sin(A + B) = 3 / 5.(2)
Next Expand equation (2),(sinA * cosB - cosA * sin B ) / (sinA * sinB + cosA * sin B) = 3 / 5 and we can get 2 * sinA * cosB = 8 cosA * sin B.
Therefore,sinA cos B / ( cosA * sin B ) = tanA / tanB = 4.End
2) From part (1) tan(A) =4 × tan B ,and now tan( A - B ) = ( tanA - tanB ) / (1 + tanA * tanB) = 3 tanB / (1 +4 tan^2 (B)) = 3 / ( (1 / tanB )+ 4 tanB )
(2)acosB-bsinA=3/5c可化为sinAcosB-sinBcosA=3/5sinC又sinC=sin(A+B)所以可化为tanA=4tanB所以tan(A-B)=(tanA-tanB)/(1+tanAtanB)=3/(1/tanB+4tanB)所以最大值为3/4当tanB=1/2