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Identity sin^2A sin^2B =sin(A+B)sin(A B) =(sin(A )+sin(B))(sin(A ) sin(B )) =2sin ( A+B2 )cos ( A B2 ).2cos ( A+B2 )sin ( A+B2 ) =2si ...

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Sin(A+B)Sin(A-B)

If α + β - ...

Question

If $α + β - γ = π$ , and ${sin}^{2} α + {sin}^{2} β - {sin}^{2} γ = λ sin α sin β cos γ$ , then write the value of $λ$ .

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