The equation 2Cos^(-1)x=Cos^(-1)(2x^(2)-...

The equation `2Cos^(-1)x=Cos^(-1)(2x^(2)-1)` is satisfied by

A

`(pi)/(3)orsin^(-1)(1//3)`

B

`(pi)/(6),orsin^(-1)(1//3)`

C

`(pi)/(3)orsin^(-1)(1//6)`

D

`(pi)/(6),orsin^(-1)(1//6)`

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