If A, B, C be the angles of a triangle, then \[\left| \,\begin{matrix} -1 & \cos C & \cos B \\ \cos C & -1 & \cos A \\ \cos B & \cos A & -1 \\ \end{matrix}\, \right|=\] [Karnataka CET 2002]

If A, B, C be the angles of a triangle, then \[\left| \,\begin{matrix}

1.	If A, B, C be the angles of a triangle, then \[\left\| \,\begin{matrix} -1 & \cos C & \cos B \\ \cos C & -1 & \cos A \\ \cos B & \cos A & -1 \\ \end{matrix}\, \right\|=\] [Karnataka CET 2002]
A.	1
B.	0
C.	\[\cos A\cos B\cos C\]
D.	\[\cos A+\cos B\cos C\]
Answer» C. \[\cos A\cos B\cos C\]

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If A, B, C be the angles of a triangle, then \[\left| \,\begin{matrix} -1 & \cos C & \cos B \\ \cos C & -1 & \cos A \\ \cos B & \cos A & -1 \\ \end{matrix}\, \right|=\] [Karnataka CET 2002]

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