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The range of f(x)=cos^(-1)x+Cosec^(-1) x...

The range of `f(x)=cos^(-1)x+Cosec^(-1)` x is

A

`( - pi/2, pi/2)`

B

`[0,pi/2]`

C

`{ - pi/2, pi/2}`

D

`{pi/2}`

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The correct Answer is:
D
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