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2 cos^(-1) x = sin^(-1) (2x sqrt(1 - x^(...

`2 cos^(-1) x = sin^(-1) (2x sqrt(1 - x^(2)))` is valid for all values of x satisfying

A

`0 le x le (1)/(sqrt2)`

B

`-1 le x le 1`

C

`0 le x le 1`

D

`(1)/(sqrt2) le x le 1`

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