lim(x→+∞) (2/π arctan X)^X

lim(x→+∞) (2/π arctan X)^X

Suppose a = (2 / π arctan x) ^ xlna = x * ln (2 / π arctan x) Lim LNA = Lim x * ln (2 / π arctan x) = Lim ln (2 / π arctan x) / x ^ - 1, Lim LNA = 2 / π / (x ^ 2 + 1) / (2 / π arctan x) / x ^ - 2 = - x ^ 2 / (arctan x * x ^ 2 + 1) = - x ^ 2 / (π / 2 * (x ^