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If for any x in(-1,1),sin^(-1)x=pi/7 the...

If for any `x in(-1,1),sin^(-1)x=pi/7` then `cos^(-1)x` = _____

A

`(3pi)/14`

B

`(5pi)/14`

C

`(pi)/14`

D

`(6pi)/7`

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