Teaching EMRS PGT Mock Test 2023 Mathematics Trigonometry Inverse Trigonometric Functions

If sin-1x + sin-1y = \(5\pi \over 6\), then what is the value of cos-1x + cos-1y?

1
\(\pi\over 2\)
2
\(\pi\over 4\)
3
\(\pi\over 6\)
4
\(\pi\over 8\)
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