1.
If f:[0,π/2)Rf : [0, \pi/2) \to \mathbb{R} is defined as f(θ)=1tanθ1tanθ1tanθ1tanθ1f(\theta) = \begin{vmatrix} 1 & \tan\theta & 1 \\ -\tan\theta & 1 & \tan\theta \\ -1 & -\tan\theta & 1 \end{vmatrix}, then the range of ff is