If \[\alpha ,\beta ,\gamma \] are angles of a triangle, then \[{{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma -2\cos \alpha \cos \beta \cos \gamma \]is [Orissa JEE 2004]

If \[\alpha ,\beta ,\gamma \] are angles of a triangle, then \[{{\sin

1.	If \[\alpha ,\beta ,\gamma \] are angles of a triangle, then \[{{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma -2\cos \alpha \cos \beta \cos \gamma \]is [Orissa JEE 2004]
A.	2
B.	-1
C.	-2
D.	0
Answer» B. -1

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If \[\alpha ,\beta ,\gamma \] are angles of a triangle, then \[{{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma -2\cos \alpha \cos \beta \cos \gamma \]is [Orissa JEE 2004]

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