1,aCOSB-bCOSA=0.6c
sinAcosB-sinBcosA=0.6sin(A+B)
0.4sinAcosB=1.6cosAsinB
tanAcotB=4
2.tan(A-B)=(tanA-tanB)/(1+tanAtanB)=3tanA/(1+tan^2B)
=3/(1/tanB+tanB) 当tanB=1时tan(A-B)最大值为3/2
1,aCOSB-bCOSA=0.6c
sinAcosB-sinBcosA=0.6sin(A+B)
0.4sinAcosB=1.6cosAsinB
tanAcotB=4
2.tan(A-B)=(tanA-tanB)/(1+tanAtanB)=3tanA/(1+tan^2B)
=3/(1/tanB+tanB) 当tanB=1时tan(A-B)最大值为3/2