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If 2tan^(-1)x+sin^(-1)((2x)/(1+x^2)) is ...

If `2tan^(-1)x+sin^(-1)((2x)/(1+x^2))` is independent of `' x '` then `x in (-1,1)` (b) `x in (-oo,-1)` `x in [1,oo)` (d) `x in (0,1)`

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