If \( A, B \) and \( C \) are the angles of a triangle, then the de...

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If \( A, B \) and \( C \) are the angles of a triangle, then the determinant
\[
\left|\begin{array}{ccc}
-1 & \cos C & \cos B \\
\cos C & -1 & \cos A \\
\cos B & \cos A & -1
\end{array}\right|
\]
is equal to
(a) 0
(b) \( -1 \)
(c) 1
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