Mathematics Trigonometry Inverse Trigonometric Functions

If cos-1 x + cos-1 y = \(\rm \frac{3\pi}{5}\) , then sin-1 x + sin-1 y = ? .

1
\(\rm\frac{\pi}{5}\)
2
\(\rm\frac{2\pi}{5}\)
3
\(\rm\frac{2\pi}{7}\)
4
\(\rm\frac{2\pi}{3}\)

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