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The domain of the function f(x)=cos^(-1...

The domain of the function `f(x)=cos^(-1)(sec(cos^-1 x))+sin^(-1)(cosec(sin^(-1)x))` is

A

`x in R`

B

x=1,-1

C

`-1 le x le 1`

D

`x in phi`

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The correct Answer is:
B
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