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If f(x) = (tan^-1 x)^2+2/(sqrt(x^2+1) t...

If ` f(x) = (tan^-1 x)^2+2/(sqrt(x^2+1)` then f is increasing in

A

`(0, infty)`

B

[1,10]

C

[3,5]

D

[2,5]

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