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