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2 cos^-1 x = sin^-1(2xsqrt(1 - x^2)) is ...

`2 cos^-1 x = sin^-1(2xsqrt(1 - x^2))` is valid for

A

`-1 le x le 1`

B

`-1/sqrt2 lt x lt 1/sqrt2`

C

`-1 le x le 1`

D

`1/sqrt2 le x le 1`

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The correct Answer is:
D
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PATHFINDER-TRIGONOMETRIC EQUATION AND INVERSE-QUESTION BANK
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