Mathematics

Mathematics

Problem

The interval of increase of the function f(x)=x−ex+tan⁡2π7f(x) = x - e^x + \tan \frac{2\pi}{7} is equal to : (A) (0,∞)(0, \infty) (B) (−∞,0)(-\infty, 0) (C) (1,∞)(1, \infty) (D) (−∞,−1)(-\infty, -1)

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