The value of $(2cos^{2}\theta-1)\left(\frac{1 + tan\theta}{1 - tan\theta}+\frac{1 - tan\theta}{1 + tan\theta}\right)$

The value of $(2cos^{2}\theta-1)\left(\frac{1 + tan\theta}{1 - tan\theta}+\frac{1 - tan\theta}{1 + tan\theta}\right)$
1). 4
2). 1
3). 3
4). 2

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