If \[{{\cos }^{-1}}\lambda +{{\cos }^{-1}}\mu +{{\cos }^{-1}}\gamma =3\pi ,\] then the value of \[\lambda \mu +\mu \gamma +\gamma \lambda \] is

If \[{{\cos }^{-1}}\lambda +{{\cos }^{-1}}\mu +{{\cos }^{-1}}\gamma =3

1.	If \[{{\cos }^{-1}}\lambda +{{\cos }^{-1}}\mu +{{\cos }^{-1}}\gamma =3\pi ,\] then the value of \[\lambda \mu +\mu \gamma +\gamma \lambda \] is
A.	0
B.	1
C.	3
D.	6
Answer» D. 6

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If \[{{\cos }^{-1}}\lambda +{{\cos }^{-1}}\mu +{{\cos }^{-1}}\gamma =3\pi ,\] then the value of \[\lambda \mu +\mu \gamma +\gamma \lambda \] is

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