railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
If cos 48° = \(\rm\frac{m}{n}\), then sec 48° - cot 42° is equal to:
1
\(\rm\frac{m-\sqrt{n^2-m^2}}{m}\)
2
\(\rm\frac{m-\sqrt{n^2-m^2}}{n}\)
3
\(\rm\frac{n-\sqrt{n^2-m^2}}{n}\)
4
\(\rm\frac{n-\sqrt{n^2-m^2}}{m}\)