If $cosec2 \theta$ = $\frac{635}{576}$, then what is the value of $\left[\frac{(sin \theta - cos \theta)}{(sin \theta + cos \theta)}\right]$?

If $cosec2 \theta$ = $\frac{635}{576}$, then what is the value of $\left[\frac{(sin \theta - cos \theta)}{(sin \theta + cos \theta)}\right]$?
1). 1
2). $\frac{31}{17}$
3). $\frac{17}{31}$
4). $\frac{14}{25}$

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