railway DMRC CRA Mock Test Series Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

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

1
(cosecA - cotA)2
2
secA - tanA
3
(secA - tanA)2
4
cosecA - cotA
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