Half Angle Formula Required?

Geometry Level 3

For θ(0,π2)\theta\in\left(0,\frac{\pi}{2}\right), which of the following is equivalent to the expression given below? tanθ+secθ1tanθsecθ+1\frac{\tan\theta+\sec\theta-1}{\tan\theta-\sec\theta+1}

This problem is part of the set Trigonometry.

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