[질문] 삼각함수의덧셈과곱셈정리알려주세요

sin(A+B)=sinAcosB+cosBsinA,sin(A-B)=sinAcosB-cosBsinA,cos(A+B)=cosAcosB-sinAsinB,cos(A-B)=cosAcosB+sinAsinB,tan(A+B)=(tanA+tanB)/(1-tanAtanB)너무깁니