1、sin(A+B)=sinAcosB+cosAsinB2、sin(A-B)=sinAcosB-sinBcosA3、cos(A+B)=cosAcosB-sinAsinB4、cos(A-B)=cosAcosB+sinAsinB5、tan(A+B)=(tanA+tanB)/(1-tanAtanB)6、tan(A-B)=(tanA-tanB)/(1+tanAtanB)