railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
If \(x\; = \;\frac{{cos\theta }}{{1 - \;sin\theta }}\) , then \(\frac{{cos\theta }}{{1\; + \;sin\theta }}\) is equal to :
1
\(\frac{1}{{1 - x}}\)
2
\(\frac{1}{{x - 1}}\)
3
\(\frac{1}{x}\)
4
\(\frac{1}{{x + 1}}\)