defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Trigonometry Inverse Trigonometric Functions
\({\tan ^{ - 1}}\frac{x}{{\sqrt {{a^2} - {x^2}} }} = \)
1
\(\frac{1}{a}{\sin ^{ - 1}}\left( {\frac{x}{a}} \right)\)
2
\(a\ {\sin ^{ - 1}}\left( {\frac{x}{a}} \right)\)
3
\({\sin ^{ - 1}}\left( {\frac{x}{a}} \right)\)
4
\({\sin ^{ - 1}}\left( {\frac{a}{x}} \right)\)