1.
If f(x)=2cosx10xπ22cosx1012cosxf(x) = \begin{vmatrix} 2\cos x & 1 & 0 \\ x-\frac{\pi}{2} & 2\cos x & 1 \\ 0 & 1 & 2\cos x \end{vmatrix}, then f(π)f'(\pi) is equal to
Matrices and Determinants - Hard - Question