If $cos^{2}\theta - sin\theta$ =$\frac{1}{4}$, then what is the value of $sin\theta$?

If $cos^{2}\theta - sin\theta$ =$\frac{1}{4}$, then what is the value of $sin\theta$?
1). -1
2). $\frac{1}{2}$
3). 1
4). $\frac{3}{2}$

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