Crey | The function f(x) = cot-1 x + x increases in the interval (1, ∞), (-1, ∞), (0, ∞), (-∞, ∞)

Question

The function f(x) = cot-1 x + x increases in the interval

Options :

(1, ∞)
(-1, ∞)
(0, ∞)
(-∞, ∞)

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