Evaluate the determinants. 1. &- & 2. x^2-x+1&x-1 +1&x+1 - Vidyadip

Question

Evaluate the determinants.

$\begin{vmatrix}\cos\theta&-\sin\theta\\\sin\theta&\cos\theta\end{vmatrix}$
$\begin{vmatrix}x^2-x+1&x-1\\x+1&x+1\end{vmatrix}$

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