defence exam BSF Head Constable (RO/RM) Mock Test 2023 Mathematics Trigonometry Inverse Trigonometric Functions
If sin-1 x + sin-1 y = \(\frac{{2\pi }}{3},\) then cos-1 x + cos-1 y =
1
\(\frac{{2\pi }}{3}\)
2
\(\frac{\pi }{3}\)
3
\(\frac{\pi }{6}\)
4
π