If \( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are angles of a triangle, then the determin...
If \( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are angles of a triangle, then the determinant
\[
\left|\begin{array}{ccc}
-1 & \cos C & \cos \mathrm{B} \\
\cos \mathrm{C} & -1 & \cos \mathrm{A} \\
\cos \mathrm{B} & \cos \mathrm{A} & -1
\end{array}\right| \text { is equal to }
\]
\( \mathrm{P} \)
VW
(A) 0
(B) \( -1 \)
(C) 1
(D) None of these
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