f(x)=cot^(- 1)(x^2-4x+5) then range of ...

`f(x)=cot^(- 1)(x^2-4x+5)` then range of `f(x)` is equal to :

A

`(0,pi/2)`

B

`(0,pi/4]`

C

`[0,pi/4)`

D

None of these

Verified by Experts

The correct Answer is:

B

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