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Range of f(x)=sin^(-1)x+tan^(-1)x+sec^(-...

Range of `f(x)=sin^(-1)x+tan^(-1)x+sec^(-1)x` is `(pi/4,(3pi)/4)` (b) `[pi/4,(3pi)/4]` `{pi/4,(3pi)/4}` (d) none of these

A

`((pi)/4,(3pi)/4)`

B

`[(pi)/4,(3pi)/4]`

C

`{(pi)/4,(3pi)/4}`

D

`((pi)/4,(3pi)/4)`

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C
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