If $\frac{(1 - sinA)}{(1 + sinA)} = x$, then x is

If $\frac{(1 - sinA)}{(1 + sinA)} = x$, then x is
1). $(cosecA - cotA)^{2}$
2). secA - tanA
3). $(secA - tanA)^{2}$
4). cosecA - cotA

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