Identify the pair(s) of functions which ...

Identify the pair(s) of functions which are identical

`y=tan(cos^(-1)x),y=sqrt(1-x^(2))/x`

`y=tan(cot^(-1)x), y=1/x`

`y=sin(arctanx),,y=x/sqrt(1+x^(2))`

`y=cos(tan^(-1)x), y=sin(cot^(-1)x)`

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The correct Answer is:

A, B, C, D

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