If f(x)=tan^(-1)sqrt(x^(2)+4x) +sin^(-1)...

If `f(x)=tan^(-1)sqrt(x^(2)+4x)` `+sin^(-1)sqrt(x^(2)+4x+1)`

A

domain of `f(x)` contains 3 integers only

B

range of `f(x)` has two elements only

C

`f(x)` is a constant function `Aax in R`

D

`f(x)` contains only two elements in its domain

Verified by Experts

The correct Answer is:

D

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