If \[(1+\sin \alpha )(1+\sin \beta )(1+\sin \gamma )=(1-\sin \alpha )\] \[(1-\sin \beta )(1-\sin \gamma )=k,\] then k is equal to:

\[+2sin\alpha sin\beta sin\gamma \]

\[2\cos \alpha \cos \beta \cos \gamma \]

\[-\cos \alpha \cos \beta \cos \gamma \]

\[+\cos \alpha \cos \beta \cos \gamma \]

If \[(1+\sin \alpha )(1+\sin \beta )(1+\sin \gamma )=(1-\sin \alpha )\

1.	If \[(1+\sin \alpha )(1+\sin \beta )(1+\sin \gamma )=(1-\sin \alpha )\] \[(1-\sin \beta )(1-\sin \gamma )=k,\] then k is equal to:
A.	\[2\cos \alpha \cos \beta \cos \gamma \]
B.	\[-\cos \alpha \cos \beta \cos \gamma \]
C.	\[+\cos \alpha \cos \beta \cos \gamma \]
D.	\[+2sin\alpha sin\beta sin\gamma \]
Answer» D. \[+2sin\alpha sin\beta sin\gamma \]

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If \[(1+\sin \alpha )(1+\sin \beta )(1+\sin \gamma )=(1-\sin \alpha )\] \[(1-\sin \beta )(1-\sin \gamma )=k,\] then k is equal to:

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