If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=\pi ,\]then

1.	If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=\pi ,\]then
A.	\[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+xyz=0\]
B.	\[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+2xyz=0\]
C.	\[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+xyz=1\]
D.	\[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+2xyz=1\]
Answer» E.

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If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=\pi ,\]then

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