Mathematics

Mathematics

Problem

The function f(x)=x+cot⁡−1xf(x) = x + \cot^{-1} x is increase in the interval : (A) (1,∞)(1, \infty) (B) (−1,∞)(-1, \infty) (C) R\mathbb{R} (D) (0,∞)(0, \infty)

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