很简单啊,要细心!
这可以化为sinB-sinc=2sinA(0.5cosC-0.5根号3sinC)
sinB=sin(180-a-c)=sin(a+c)
sin(a+c)-sinc=sinacosc-根号3sinasinc
cosasinc-sinc=-根号3sinasinc
sinc=
so cosa+根号3sina=1
2cos(a-60)=1
so a=120
很简单啊,要细心!
这可以化为sinB-sinc=2sinA(0.5cosC-0.5根号3sinC)
sinB=sin(180-a-c)=sin(a+c)
sin(a+c)-sinc=sinacosc-根号3sinasinc
cosasinc-sinc=-根号3sinasinc
sinc=
so cosa+根号3sina=1
2cos(a-60)=1
so a=120