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" -6."sin A sin(A+2B)-sin B sin(2A+B)=si...

" -6."sin A sin(A+2B)-sin B sin(2A+B)=sin(A-B)sin(A+1

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sin A sin (A + 2B) -sin B sin (B + 2A) = sin (AB) sin (A + B)

sin A sin (A + 2B) sin B sin (B + 2A) = sin (AB) sin (A + B)

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

sin(A+B).sin(A- B)=sin^(2)A-sin^(2)B

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