Three expressions are given below : ...

Three expressions are given below :
`Q_(1)=sin(A+B)+sin(B+C)+sin(C+A)`
`Q_(2)=cos(A-B)+cos(B-C)+cos(C-A)`
`Q_(3)=sinA(cosB+cosC)+sinB(cosC+cosA)+sinC(cosA+cosB)`
Which one the following is correct ?

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