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

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

1
-3π/4
2
π/4
3
-π/4
4
3π/2
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