由已知:sin(2π-A)=-sinA=-2^0.5*sin(π-B)=-2^0.5*sinB,3^0.5*cos(2π-A)=3^0.5*cosA=-2^0.5*cos(π+B)=2^0.5*cosB.
即sinA=2^0.5*sinB,3^0.5*cosA=2^0.5*cosB,且0
由已知:sin(2π-A)=-sinA=-2^0.5*sin(π-B)=-2^0.5*sinB,3^0.5*cos(2π-A)=3^0.5*cosA=-2^0.5*cos(π+B)=2^0.5*cosB.
即sinA=2^0.5*sinB,3^0.5*cosA=2^0.5*cosB,且0