If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=3\pi ,\]then \[xy+yz+zx=\] [Karnataka CET 2003]

If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=3\pi ,\]then \[xy

1.	If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=3\pi ,\]then \[xy+yz+zx=\] [Karnataka CET 2003]
A.	0
B.	1
C.	3
D.	-3
Answer» D. -3

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If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y+{{\cos }^{-1}}z=3\pi ,\]then \[xy+yz+zx=\] [Karnataka CET 2003]

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