If \( \alpha+\beta-\gamma=\pi \), then \( \sin ^{2} \alpha+\sin ^{2} \beta-\sin ^{2} \gamma \) i...
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0If \( \alpha+\beta-\gamma=\pi \), then \( \sin ^{2} \alpha+\sin ^{2} \beta-\sin ^{2} \gamma \) is equal to
(A) \( 2 \sin \alpha \sin \beta \cos \gamma \)
(B) \( 2 \sin \alpha \sin \beta \sin \gamma \)
(C) \( 2 \cos \alpha \cos \beta \cos \gamma \)
(D) none of these
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