railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Circular Measure of Angles
The value of sin 18° is given as \({\sqrt 5 - 1} \over {4}\). Find the value of cosec 18°.
1
\({ \sqrt 5 + 1} \over 4\)
2
\({ \sqrt 5 +1} \over 2\)
3
\(\sqrt 5 - 1\)
4
\(\sqrt 5 + 1\)