trigonometry

Question: If $\alpha +\beta -\gamma =\pi ,$then${{\sin }^{2}}\alpha +{{\sin }^{2}}\beta -{{\sin }^{2}}\gamma =$

1) $2\,\sin \alpha \,\sin \beta \,\cos \gamma $

2) $2\,\cos \alpha \,\cos \beta \,\cos \gamma $

3) $2\,\sin \alpha \,\sin \beta \sin \gamma $

4) None of these

Solution:

Explanation: No Explanation

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