Помогите, пожалуйста, найти интеграл
int 1/(x * ln^4 x) dx
int 1/(x * ln^4 x) dx = int 1/ln^4 x d(ln x) = | t = ln x | = int 1/t^4 dt =
= int t^(-4) dt = 1/(-4 + 1) * t^(-4 + 1) + C = -1/3 * t^(-3) + C =
= -1/3 * 1/t^3 + C = | t = ln x | = -1/3 * 1/ln^3 x + C
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