1.
If f(x)=2cosx10π2x2cosx1012cosxf(x) = \begin{vmatrix} 2\cos x & 1 & 0 \\ \frac{\pi}{2} - x & 2\cos x & 1 \\ 0 & 1 & 2\cos x \end{vmatrix}, then f(π)f'(\pi) is equal to