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If f(x)=2x+cot^(-1)x+log(sqrt(1+x^2)-x) ...

If `f(x)=2x+cot^(-1)x+log(sqrt(1+x^2)-x)` then `f(x)` (a)increase in `(0,oo)` (b)decrease in `[0,oo]` (c)neither increases nor decreases in `[0,oo]` (d)increase in `(-oo,oo)`

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