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

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

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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

Show that: sin A + sin B +sin C - sin(A+B+C)=4 sin ((A+B)/2)sin ((B+C)/2)sin ((C+A)/2)

If A+B+C= 180^(@) , " then " ( sin 2A- sin 2B- sin 2C)/(sin 2B- sin 2A - sin 2C)=

What is the value of sin(A+B)sin(A-B)+sin(B+C)sin(B-C)+sin(C+A)sin(C-A) ?

Prove that: (sin(A-C)+2sin A+sin(A+C))/(sin(B-C)+2sin B+sin(B+C))=(sin A)/(sin B)