If $\frac{\sqrt{[(1-cosA)]}}{2}$ = x, then the value of x is

If $\frac{\sqrt{[(1-cosA)]}}{2}$ = x, then the value of x is
1). $\frac{(cos A)}{2}$
2). $\frac{(tan A)}{2}$
3). $\frac{(sin A)}{2}$
4). $\frac{(cot A)}{2}$

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