If \( a, b, c \in \boldsymbol{R} \) and \( a^{2}+b^{2}-a b-a-b+1 \l...
If \( a, b, c \in \boldsymbol{R} \) and \( a^{2}+b^{2}-a b-a-b+1 \leq 0 \) and \( \alpha+\beta+\gamma=0 \), then
\( \Delta=\left|\begin{array}{ccc}1 & \cos \gamma & \cos \beta \\ \cos \gamma & a & \cos \alpha \\ \cos \alpha & \cos \beta & b\end{array}\right| \) equals
(a) \( a b \)
(b) 1
(c) 0
(d) \( -1 \)
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