Question
If $f(x) = \begin{vmatrix} \cos x & 1 & 0 \\ 0 & 2 \cos x & 3 \\ 0 & 1 & 2 \cos x \end{vmatrix}$, then $\lim_{x \to \pi} f(x) =$
If $f(x) = \begin{vmatrix} \cos x & 1 & 0 \\ 0 & 2 \cos x & 3 \\ 0 & 1 & 2 \cos x \end{vmatrix}$, then $\lim_{x \to \pi} f(x) =$