cos(A+B)=?sin(A+B)=?
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cos(A+B)=?sin(A+B)=?
cos(A+B)=?sin(A+B)=?
cos(A+B)=?sin(A+B)=?
sin(A+B)=sinAcosB+cosAsinB
cos(A+B)=cosAcosB-sinAsinB
cos(A+B)=cosAcosB-sinAsinB
nc……
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