MCQ
$\left|\begin{array}{ccc}1 & -a & -b \\ a & 1 & -c \\ b & c & 1\end{array}\right|=$_______.
- ✓$1+a^2+b^2+c^2$
- B$-\left(1+a^2+b^2+c^2\right)$
- C$1-a^2-b^2-c^2$
- D$a^2+b^2+c^2-1$
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