engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Trigonometry Inverse Trigonometric Functions

जर sin -1 x + sin -1 y = \(\rm \frac{3\pi}{4}\) , तर cos -1 x + cos -1 y = ? 

1
-3π/4
2
π/4 
3
-π/4
4
3π/2 
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