f(x)=tan^(-1)x+tan^(-1)(1/x);g(x)=sin^(-...

`f(x)=tan^(-1)x+tan^(-1)(1/x);g(x)=sin^(-1)x+cos^(-1)x` are identical functions if (A)`x in R` (B) `x >0` (C) `x in [-1,1]` (D) `x in [0,1]`

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