If "cos"^(-1)x+"cos"^(-1)y=(2pi)/(7), th...

If `"cos"^(-1)x+"cos"^(-1)y=(2pi)/(7)`, then the value of
`"sin"^(-1)x+"sin"^(-1)y` is

A

`(4pi)/(7)`

B

`(3pi)/(7)`

C

`(5pi)/(7)`

D

`(6pi)/(7)`

Verified by Experts

The correct Answer is:

C

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