两角和公式
sin(A+B) = sinAcosB+cosAsinB ,sin(A-B) = sinAcosB-cosAsinB
cos(A+B) = cosAcosB-sinAsinB ,cos(A-B) = cosAcosB+sinAsinB
tan(A+B) = (tanA+tanB)/(1-tanAtanB) ,tan(A-B) = (tanA-t...
两角和公式
sin(A+B) = sinAcosB+cosAsinB ,sin(A-B) = sinAcosB-cosAsinB
cos(A+B) = cosAcosB-sinAsinB ,cos(A-B) = cosAcosB+sinAsinB
tan(A+B) = (tanA+tanB)/(1-tanAtanB) ,tan(A-B) = (tanA-t...