A,B均为锐角=>cosA>0,cosB>0
cosA=1/3=>sinA=2√2/3
cos(A+B)=cosAcosB-sinAsinB=cosB/3-(2√2sinB/3)=-3/5
联立sinB^2+cosB^2=1
得sinB=(4+6√2)/15
cosB=(8√2-3)/15
A,B均为锐角=>cosA>0,cosB>0
cosA=1/3=>sinA=2√2/3
cos(A+B)=cosAcosB-sinAsinB=cosB/3-(2√2sinB/3)=-3/5
联立sinB^2+cosB^2=1
得sinB=(4+6√2)/15
cosB=(8√2-3)/15