railway RRB Technician Grade 3 Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
The principal value of sin-1 \(\frac{1}{\sqrt{2}}\) is :
1
\(\frac{\pi}{4}\)
2
\(\frac{3\pi}{4}\)
3
\(\frac{\pi}{6}\)
4
\(\frac{\pi}{2}\)