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If $\cosec\theta=1+\cot\theta$, then $\theta$=
Difficulty: Easy
A: 
$2n\pi \pm \frac{\pi}{2}$
B: 
$2n\pi \pm \frac{\pi}{4}$
C: 
$2n\pi +\frac{\pi}{2}$
D: 
$2n\pi-\frac{\pi}{2}$
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